/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.camera;

import android.Manifest;
import android.animation.Animator;
import android.app.ActionBar;
import android.app.Activity;
import android.app.Dialog;
import android.content.ActivityNotFoundException;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.RectF;
import android.graphics.SurfaceTexture;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.nfc.NfcAdapter;
import android.nfc.NfcAdapter.CreateBeamUrisCallback;
import android.nfc.NfcEvent;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.provider.MediaStore;
import android.provider.Settings;
import android.text.TextUtils;
import android.util.CameraPerformanceTracker;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnSystemUiVisibilityChangeListener;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ShareActionProvider;

import com.android.camera.app.AppController;
import com.android.camera.app.CameraAppUI;
import com.android.camera.app.CameraController;
import com.android.camera.app.CameraProvider;
import com.android.camera.app.CameraServices;
import com.android.camera.app.CameraServicesImpl;
import com.android.camera.app.FirstRunDialog;
import com.android.camera.app.LocationManager;
import com.android.camera.app.MemoryManager;
import com.android.camera.app.MemoryQuery;
import com.android.camera.app.ModuleManager;
import com.android.camera.app.ModuleManager.ModuleAgent;
import com.android.camera.app.ModuleManagerImpl;
import com.android.camera.app.MotionManager;
import com.android.camera.app.OrientationManager;
import com.android.camera.app.OrientationManagerImpl;
import com.android.camera.data.CameraFilmstripDataAdapter;
import com.android.camera.data.FilmstripContentObserver;
import com.android.camera.data.FilmstripItem;
import com.android.camera.data.FilmstripItemData;
import com.android.camera.data.FilmstripItemType;
import com.android.camera.data.FilmstripItemUtils;
import com.android.camera.data.FixedLastProxyAdapter;
import com.android.camera.data.GlideFilmstripManager;
import com.android.camera.data.LocalFilmstripDataAdapter;
import com.android.camera.data.LocalFilmstripDataAdapter.FilmstripItemListener;
import com.android.camera.data.MediaDetails;
import com.android.camera.data.MetadataLoader;
import com.android.camera.data.PhotoDataFactory;
import com.android.camera.data.PhotoItem;
import com.android.camera.data.PhotoItemFactory;
import com.android.camera.data.PlaceholderItem;
import com.android.camera.data.SessionItem;
import com.android.camera.data.VideoDataFactory;
import com.android.camera.data.VideoItemFactory;
import com.android.camera.debug.Log;
import com.android.camera.device.ActiveCameraDeviceTracker;
import com.android.camera.device.CameraId;
import com.android.camera.filmstrip.FilmstripContentPanel;
import com.android.camera.filmstrip.FilmstripController;
import com.android.camera.module.ModuleController;
import com.android.camera.module.ModulesInfo;
import com.android.camera.one.OneCameraException;
import com.android.camera.one.OneCameraManager;
import com.android.camera.one.OneCameraModule;
import com.android.camera.one.OneCameraOpener;
import com.android.camera.one.config.OneCameraFeatureConfig;
import com.android.camera.one.config.OneCameraFeatureConfigCreator;
import com.android.camera.session.CaptureSession;
import com.android.camera.session.CaptureSessionManager;
import com.android.camera.session.CaptureSessionManager.SessionListener;
import com.android.camera.settings.AppUpgrader;
import com.android.camera.settings.CameraSettingsActivity;
import com.android.camera.settings.Keys;
import com.android.camera.settings.PictureSizeLoader;
import com.android.camera.settings.ResolutionSetting;
import com.android.camera.settings.ResolutionUtil;
import com.android.camera.settings.SettingsManager;
import com.android.camera.stats.UsageStatistics;
import com.android.camera.stats.profiler.Profile;
import com.android.camera.stats.profiler.Profiler;
import com.android.camera.stats.profiler.Profilers;
import com.android.camera.tinyplanet.TinyPlanetFragment;
import com.android.camera.ui.AbstractTutorialOverlay;
import com.android.camera.ui.DetailsDialog;
import com.android.camera.ui.MainActivityLayout;
import com.android.camera.ui.ModeListView;
import com.android.camera.ui.ModeListView.ModeListVisibilityChangedListener;
import com.android.camera.ui.PreviewStatusListener;
import com.android.camera.util.ApiHelper;
import com.android.camera.util.Callback;
import com.android.camera.util.CameraUtil;
import com.android.camera.util.GalleryHelper;
import com.android.camera.util.GcamHelper;
import com.android.camera.util.GoogleHelpHelper;
import com.android.camera.util.IntentHelper;
import com.android.camera.util.PhotoSphereHelper.PanoramaViewHelper;
import com.android.camera.util.QuickActivity;
import com.android.camera.util.ReleaseHelper;
import com.android.camera.widget.FilmstripView;
import com.android.camera.widget.Preloader;
import com.android.camera2.R;
import com.android.ex.camera2.portability.CameraAgent;
import com.android.ex.camera2.portability.CameraAgentFactory;
import com.android.ex.camera2.portability.CameraExceptionHandler;
import com.android.ex.camera2.portability.CameraSettings;
import com.bumptech.glide.Glide;
import com.bumptech.glide.GlideBuilder;
import com.bumptech.glide.MemoryCategory;
import com.bumptech.glide.load.DecodeFormat;
import com.bumptech.glide.load.engine.executor.FifoPriorityThreadPoolExecutor;

import com.google.common.base.Optional;
import com.google.common.logging.eventprotos;
import com.google.common.logging.eventprotos.ForegroundEvent.ForegroundSource;
import com.google.common.logging.eventprotos.MediaInteraction;
import com.google.common.logging.eventprotos.NavigationChange;

import java.io.File;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class CameraActivity extends QuickActivity implements AppController, CameraAgent.CameraOpenCallback,
        ShareActionProvider.OnShareTargetSelectedListener
{

    private static final Log.Tag TAG = new Log.Tag("CameraActivity");

    private static final String INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE = "android.media.action" +
            ".STILL_IMAGE_CAMERA_SECURE";
    public static final String ACTION_IMAGE_CAPTURE_SECURE = "android.media.action.IMAGE_CAPTURE_SECURE";

    // The intent extra for camera from secure lock screen. True if the gallery
    // should only show newly captured pictures. sSecureAlbumId does not
    // increment. This is used when switching between camera, camcorder, and
    // panorama. If the extra is not set, it is in the normal camera mode.
    public static final String SECURE_CAMERA_EXTRA = "secure_camera";

    private static final int MSG_CLEAR_SCREEN_ON_FLAG = 2;
    private static final long SCREEN_DELAY_MS = 2 * 60 * 1000; // 2 mins.
    /**
     * Load metadata for 10 items ahead of our current.
     */
    private static final int FILMSTRIP_PRELOAD_AHEAD_ITEMS = 10;
    private static final int PERMISSIONS_ACTIVITY_REQUEST_CODE = 1;
    private static final int PERMISSIONS_RESULT_CODE_OK = 1;
    private static final int PERMISSIONS_RESULT_CODE_FAILED = 2;

    /**
     * Should be used wherever a context is needed.
     */
    private Context mAppContext;

    /**
     * Camera fatal error handling:
     * 1) Present error dialog to guide users to exit the app.
     * 2) If users hit home button, onPause should just call finish() to exit the app.
     */
    private boolean mCameraFatalError = false;

    /**
     * Whether onResume should reset the view to the preview.
     */
    private boolean mResetToPreviewOnResume = true;

    /**
     * This data adapter is used by FilmStripView.
     */
    private VideoItemFactory mVideoItemFactory;
    private PhotoItemFactory mPhotoItemFactory;
    private LocalFilmstripDataAdapter mDataAdapter;

    private ActiveCameraDeviceTracker mActiveCameraDeviceTracker;
    private OneCameraOpener mOneCameraOpener;
    private OneCameraManager mOneCameraManager;
    private SettingsManager mSettingsManager;
    private ResolutionSetting mResolutionSetting;
    private ModeListView mModeListView;
    private boolean mModeListVisible = false;
    private int mCurrentModeIndex;
    private CameraModule mCurrentModule;
    private ModuleManagerImpl mModuleManager;
    private FrameLayout mAboveFilmstripControlLayout;
    private FilmstripController mFilmstripController;
    private boolean mFilmstripVisible;
    /**
     * Whether the filmstrip fully covers the preview.
     */
    private boolean mFilmstripCoversPreview = false;
    private int mResultCodeForTesting;
    private Intent mResultDataForTesting;
    private OnScreenHint mStorageHint;
    private final Object mStorageSpaceLock = new Object();
    private long mStorageSpaceBytes = Storage.LOW_STORAGE_THRESHOLD_BYTES;
    private boolean mAutoRotateScreen;
    private boolean mSecureCamera;
    private OrientationManagerImpl mOrientationManager;
    private LocationManager mLocationManager;
    private ButtonManager mButtonManager;
    private Handler mMainHandler;
    private PanoramaViewHelper mPanoramaViewHelper;
    private ActionBar mActionBar;
    private ViewGroup mUndoDeletionBar;
    private boolean mIsUndoingDeletion = false;
    private boolean mIsActivityRunning = false;
    private FatalErrorHandler mFatalErrorHandler;
    private boolean mHasCriticalPermissions;

    private final Uri[] mNfcPushUris = new Uri[1];

    private FilmstripContentObserver mLocalImagesObserver;
    private FilmstripContentObserver mLocalVideosObserver;

    private boolean mPendingDeletion = false;

    private CameraController mCameraController;
    private boolean mPaused;
    private CameraAppUI mCameraAppUI;

    private Intent mGalleryIntent;
    private long mOnCreateTime;

    private Menu mActionBarMenu;
    private Preloader<Integer, AsyncTask> mPreloader;

    /**
     * Can be used to play custom sounds.
     */
    private SoundPlayer mSoundPlayer;

    /**
     * Holds configuration for various OneCamera features.
     */
    private OneCameraFeatureConfig mFeatureConfig;

    private static final int LIGHTS_OUT_DELAY_MS = 4000;
    private final int BASE_SYS_UI_VISIBILITY = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View
            .SYSTEM_UI_FLAG_LAYOUT_STABLE;
    private final Runnable mLightsOutRunnable = new Runnable()
    {
        @Override
        public void run()
        {
            getWindow().getDecorView().setSystemUiVisibility(BASE_SYS_UI_VISIBILITY | View.SYSTEM_UI_FLAG_LOW_PROFILE);
        }
    };
    private MemoryManager mMemoryManager;
    private MotionManager mMotionManager;
    private final Profiler mProfiler = Profilers.instance().guard();

    /**
     * First run dialog
     */
    private FirstRunDialog mFirstRunDialog;

    @Override
    public CameraAppUI getCameraAppUI()
    {
        return mCameraAppUI;
    }

    @Override
    public ModuleManager getModuleManager()
    {
        return mModuleManager;
    }

    /**
     * Close activity when secure app passes lock screen or screen turns
     * off.
     */
    private final BroadcastReceiver mShutdownReceiver = new BroadcastReceiver()
    {
        @Override
        public void onReceive(Context context, Intent intent)
        {
            finish();
        }
    };

    /**
     * Whether the screen is kept turned on.
     */
    private boolean mKeepScreenOn;
    private int mLastLayoutOrientation;
    private final CameraAppUI.BottomPanel.Listener mMyFilmstripBottomControlListener = new CameraAppUI.BottomPanel
            .Listener()
    {

        /**
         * If the current photo is a photo sphere, this will launch the
         * Photo Sphere panorama viewer.
         */
        @Override
        public void onExternalViewer()
        {
            if (mPanoramaViewHelper == null)
            {
                return;
            }
            final FilmstripItem data = getCurrentLocalData();
            if (data == null)
            {
                Log.w(TAG, "Cannot open null data.");
                return;
            }
            final Uri contentUri = data.getData().getUri();
            if (contentUri == Uri.EMPTY)
            {
                Log.w(TAG, "Cannot open empty URL.");
                return;
            }

            if (data.getMetadata().isUsePanoramaViewer())
            {
                mPanoramaViewHelper.showPanorama(CameraActivity.this, contentUri);
            } else if (data.getMetadata().isHasRgbzData())
            {
                mPanoramaViewHelper.showRgbz(contentUri);
                if (mSettingsManager.getBoolean(SettingsManager.SCOPE_GLOBAL, Keys
                        .KEY_SHOULD_SHOW_REFOCUS_VIEWER_CLING))
                {
                    mSettingsManager.set(SettingsManager.SCOPE_GLOBAL, Keys.KEY_SHOULD_SHOW_REFOCUS_VIEWER_CLING,
                            false);
                    mCameraAppUI.clearClingForViewer(CameraAppUI.BottomPanel.VIEWER_REFOCUS);
                }
            }
        }

        @Override
        public void onEdit()
        {
            FilmstripItem data = getCurrentLocalData();
            if (data == null)
            {
                Log.w(TAG, "Cannot edit null data.");
                return;
            }
            final int currentDataId = getCurrentDataId();
            UsageStatistics.instance()
                    .mediaInteraction(fileNameFromAdapterAtIndex(currentDataId), MediaInteraction.InteractionType
                            .EDIT, NavigationChange.InteractionCause.BUTTON, fileAgeFromAdapterAtIndex(currentDataId));
            launchEditor(data);
        }

        @Override
        public void onTinyPlanet()
        {
            FilmstripItem data = getCurrentLocalData();
            if (data == null)
            {
                Log.w(TAG, "Cannot edit tiny planet on null data.");
                return;
            }
            launchTinyPlanetEditor(data);
        }

        @Override
        public void onDelete()
        {
            final int currentDataId = getCurrentDataId();
            UsageStatistics.instance()
                    .mediaInteraction(fileNameFromAdapterAtIndex(currentDataId), MediaInteraction.InteractionType
                            .DELETE, NavigationChange.InteractionCause.BUTTON, fileAgeFromAdapterAtIndex
                            (currentDataId));
            removeItemAt(currentDataId);
        }

        @Override
        public void onShare()
        {
            final FilmstripItem data = getCurrentLocalData();
            if (data == null)
            {
                Log.w(TAG, "Cannot share null data.");
                return;
            }

            final int currentDataId = getCurrentDataId();
            UsageStatistics.instance()
                    .mediaInteraction(fileNameFromAdapterAtIndex(currentDataId), MediaInteraction.InteractionType
                            .SHARE, NavigationChange.InteractionCause.BUTTON, fileAgeFromAdapterAtIndex(currentDataId));
            // If applicable, show release information before this item
            // is shared.
            if (ReleaseHelper.shouldShowReleaseInfoDialogOnShare(data))
            {
                ReleaseHelper.showReleaseInfoDialog(CameraActivity.this, new Callback<Void>()
                {
                    @Override
                    public void onCallback(Void result)
                    {
                        share(data);
                    }
                });
            } else
            {
                share(data);
            }
        }

        private void share(FilmstripItem data)
        {
            Intent shareIntent = getShareIntentByData(data);
            if (shareIntent != null)
            {
                try
                {
                    launchActivityByIntent(shareIntent);
                    mCameraAppUI.getFilmstripBottomControls().setShareEnabled(false);
                } catch (ActivityNotFoundException ex)
                {
                    // Nothing.
                }
            }
        }

        private int getCurrentDataId()
        {
            return mFilmstripController.getCurrentAdapterIndex();
        }

        private FilmstripItem getCurrentLocalData()
        {
            return mDataAdapter.getItemAt(getCurrentDataId());
        }

        /**
         * Sets up the share intent and NFC properly according to the
         * data.
         *
         * @param item The data to be shared.
         */
        private Intent getShareIntentByData(final FilmstripItem item)
        {
            Intent intent = null;
            final Uri contentUri = item.getData().getUri();
            final String msgShareTo = getResources().getString(R.string.share_to);

            if (item.getMetadata().isPanorama360() && item.getData().getUri() != Uri.EMPTY)
            {
                intent = new Intent(Intent.ACTION_SEND);
                intent.setType(FilmstripItemData.MIME_TYPE_PHOTOSPHERE);
                intent.putExtra(Intent.EXTRA_STREAM, contentUri);
            } else if (item.getAttributes().canShare())
            {
                final String mimeType = item.getData().getMimeType();
                intent = getShareIntentFromType(mimeType);
                if (intent != null)
                {
                    intent.putExtra(Intent.EXTRA_STREAM, contentUri);
                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                }
                intent = Intent.createChooser(intent, msgShareTo);
            }
            return intent;
        }

        /**
         * Get the share intent according to the mimeType
         *
         * @param mimeType The mimeType of current data.
         * @return the video/image's ShareIntent or null if mimeType is
         *         invalid.
         */
        private Intent getShareIntentFromType(String mimeType)
        {
            // Lazily create the intent object.
            Intent intent = new Intent(Intent.ACTION_SEND);
            if (mimeType.startsWith("video/"))
            {
                intent.setType("video/*");
            } else
            {
                if (mimeType.startsWith("image/"))
                {
                    intent.setType("image/*");
                } else
                {
                    Log.w(TAG, "unsupported mimeType " + mimeType);
                }
            }
            return intent;
        }

        @Override
        public void onProgressErrorClicked()
        {
            FilmstripItem data = getCurrentLocalData();
            getServices().getCaptureSessionManager().removeErrorMessage(data.getData().getUri());
            updateBottomControlsByData(data);
        }
    };

    @Override
    public void onCameraOpened(CameraAgent.CameraProxy camera)
    {
        Log.v(TAG, "onCameraOpened");
        if (mPaused)
        {
            // We've paused, but just asynchronously opened the camera. Close it
            // because we should be releasing the camera when paused to allow
            // other apps to access it.
            Log.v(TAG, "received onCameraOpened but activity is paused, closing Camera");
            mCameraController.closeCamera(false);
            return;
        }

        if (!mModuleManager.getModuleAgent(mCurrentModeIndex).requestAppForCamera())
        {
            // We shouldn't be here. Just close the camera and leave.
            mCameraController.closeCamera(false);
            throw new IllegalStateException("Camera opened but the module shouldn't be " + "requesting");
        }
        if (mCurrentModule != null)
        {
            resetExposureCompensationToDefault(camera);
            try
            {
                mCurrentModule.onCameraAvailable(camera);
            } catch (RuntimeException ex)
            {
                Log.e(TAG, "Error connecting to camera", ex);
                mFatalErrorHandler.onCameraOpenFailure();
            }
        } else
        {
            Log.v(TAG, "mCurrentModule null, not invoking onCameraAvailable");
        }
        Log.v(TAG, "invoking onChangeCamera");
        mCameraAppUI.onChangeCamera();
    }

    private void resetExposureCompensationToDefault(CameraAgent.CameraProxy camera)
    {
        // Reset the exposure compensation before handing the camera to module.
        CameraSettings cameraSettings = camera.getSettings();
        cameraSettings.setExposureCompensationIndex(0);
        camera.applySettings(cameraSettings);
    }

    @Override
    public void onCameraDisabled(int cameraId)
    {
        Log.w(TAG, "Camera disabled: " + cameraId);
        mFatalErrorHandler.onCameraDisabledFailure();
    }

    @Override
    public void onDeviceOpenFailure(int cameraId, String info)
    {
        Log.w(TAG, "Camera open failure: " + info);
        mFatalErrorHandler.onCameraOpenFailure();
    }

    @Override
    public void onDeviceOpenedAlready(int cameraId, String info)
    {
        Log.w(TAG, "Camera open already: " + cameraId + "," + info);
        mFatalErrorHandler.onGenericCameraAccessFailure();
    }

    @Override
    public void onReconnectionFailure(CameraAgent mgr, String info)
    {
        Log.w(TAG, "Camera reconnection failure:" + info);
        mFatalErrorHandler.onCameraReconnectFailure();
    }

    private static class MainHandler extends Handler
    {
        final WeakReference<CameraActivity> mActivity;

        public MainHandler(CameraActivity activity, Looper looper)
        {
            super(looper);
            mActivity = new WeakReference<CameraActivity>(activity);
        }

        @Override
        public void handleMessage(Message msg)
        {
            CameraActivity activity = mActivity.get();
            if (activity == null)
            {
                return;
            }
            switch (msg.what)
            {

                case MSG_CLEAR_SCREEN_ON_FLAG:
                {
                    if (!activity.mPaused)
                    {
                        activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
                    }
                    break;
                }
            }
        }
    }

    private String fileNameFromAdapterAtIndex(int index)
    {
        final FilmstripItem filmstripItem = mDataAdapter.getItemAt(index);
        if (filmstripItem == null)
        {
            return "";
        }

        File localFile = new File(filmstripItem.getData().getFilePath());
        return localFile.getName();
    }

    private float fileAgeFromAdapterAtIndex(int index)
    {
        final FilmstripItem filmstripItem = mDataAdapter.getItemAt(index);
        if (filmstripItem == null)
        {
            return 0;
        }

        File localFile = new File(filmstripItem.getData().getFilePath());
        return 0.001f * (System.currentTimeMillis() - localFile.lastModified());
    }

    private final FilmstripContentPanel.Listener mFilmstripListener = new FilmstripContentPanel.Listener()
    {

        @Override
        public void onSwipeOut()
        {
        }

        @Override
        public void onSwipeOutBegin()
        {
            mActionBar.hide();
            mCameraAppUI.hideBottomControls();
            mFilmstripCoversPreview = false;
            updatePreviewVisibility();
        }

        @Override
        public void onFilmstripHidden()
        {
            mFilmstripVisible = false;
            UsageStatistics.instance()
                    .changeScreen(currentUserInterfaceMode(), NavigationChange.InteractionCause.SWIPE_RIGHT);
            CameraActivity.this.setFilmstripUiVisibility(false);
            // When the user hide the filmstrip (either swipe out or
            // tap on back key) we move to the first item so next time
            // when the user swipe in the filmstrip, the most recent
            // one is shown.
            mFilmstripController.goToFirstItem();
        }

        @Override
        public void onFilmstripShown()
        {
            mFilmstripVisible = true;
            mCameraAppUI.hideCaptureIndicator();
            UsageStatistics.instance()
                    .changeScreen(currentUserInterfaceMode(), NavigationChange.InteractionCause.SWIPE_LEFT);
            updateUiByData(mFilmstripController.getCurrentAdapterIndex());
        }

        @Override
        public void onFocusedDataLongPressed(int adapterIndex)
        {
            // Do nothing.
        }

        @Override
        public void onFocusedDataPromoted(int adapterIndex)
        {
            UsageStatistics.instance()
                    .mediaInteraction(fileNameFromAdapterAtIndex(adapterIndex), MediaInteraction.InteractionType
                            .DELETE, NavigationChange.InteractionCause.SWIPE_UP, fileAgeFromAdapterAtIndex
                            (adapterIndex));
            removeItemAt(adapterIndex);
        }

        @Override
        public void onFocusedDataDemoted(int adapterIndex)
        {
            UsageStatistics.instance()
                    .mediaInteraction(fileNameFromAdapterAtIndex(adapterIndex), MediaInteraction.InteractionType
                            .DELETE, NavigationChange.InteractionCause.SWIPE_DOWN, fileAgeFromAdapterAtIndex
                            (adapterIndex));
            removeItemAt(adapterIndex);
        }

        @Override
        public void onEnterFullScreenUiShown(int adapterIndex)
        {
            if (mFilmstripVisible)
            {
                CameraActivity.this.setFilmstripUiVisibility(true);
            }
        }

        @Override
        public void onLeaveFullScreenUiShown(int adapterIndex)
        {
            // Do nothing.
        }

        @Override
        public void onEnterFullScreenUiHidden(int adapterIndex)
        {
            if (mFilmstripVisible)
            {
                CameraActivity.this.setFilmstripUiVisibility(false);
            }
        }

        @Override
        public void onLeaveFullScreenUiHidden(int adapterIndex)
        {
            // Do nothing.
        }

        @Override
        public void onEnterFilmstrip(int adapterIndex)
        {
            if (mFilmstripVisible)
            {
                CameraActivity.this.setFilmstripUiVisibility(true);
            }
        }

        @Override
        public void onLeaveFilmstrip(int adapterIndex)
        {
            // Do nothing.
        }

        @Override
        public void onDataReloaded()
        {
            if (!mFilmstripVisible)
            {
                return;
            }
            updateUiByData(mFilmstripController.getCurrentAdapterIndex());
        }

        @Override
        public void onDataUpdated(int adapterIndex)
        {
            if (!mFilmstripVisible)
            {
                return;
            }
            updateUiByData(mFilmstripController.getCurrentAdapterIndex());
        }

        @Override
        public void onEnterZoomView(int adapterIndex)
        {
            if (mFilmstripVisible)
            {
                CameraActivity.this.setFilmstripUiVisibility(false);
            }
        }

        @Override
        public void onZoomAtIndexChanged(int adapterIndex, float zoom)
        {
            final FilmstripItem filmstripItem = mDataAdapter.getItemAt(adapterIndex);
            long ageMillis = System.currentTimeMillis() - filmstripItem.getData().getLastModifiedDate().getTime();

            // Do not log if items is to old or does not have a path (which is
            // being used as a key).
            if (TextUtils.isEmpty(filmstripItem.getData()
                    .getFilePath()) || ageMillis > UsageStatistics.VIEW_TIMEOUT_MILLIS)
            {
                return;
            }
            File localFile = new File(filmstripItem.getData().getFilePath());
            UsageStatistics.instance()
                    .mediaView(localFile.getName(), filmstripItem.getData().getLastModifiedDate().getTime(), zoom);
        }

        @Override
        public void onDataFocusChanged(final int prevIndex, final int newIndex)
        {
            if (!mFilmstripVisible)
            {
                return;
            }
            // TODO: This callback is UI event callback, should always
            // happen on UI thread. Find the reason for this
            // runOnUiThread() and fix it.
            runOnUiThread(new Runnable()
            {
                @Override
                public void run()
                {
                    updateUiByData(newIndex);
                }
            });
        }

        @Override
        public void onScroll(int firstVisiblePosition, int visibleItemCount, int totalItemCount)
        {
            mPreloader.onScroll(null /*absListView*/, firstVisiblePosition, visibleItemCount, totalItemCount);
        }
    };

    private final FilmstripItemListener mFilmstripItemListener = new FilmstripItemListener()
    {
        @Override
        public void onMetadataUpdated(List<Integer> indexes)
        {
            if (mPaused)
            {
                // Callback after the activity is paused.
                return;
            }
            int currentIndex = mFilmstripController.getCurrentAdapterIndex();
            for (Integer index : indexes)
            {
                if (index == currentIndex)
                {
                    updateUiByData(index);
                    // Currently we have only 1 data can be matched.
                    // No need to look for more, break.
                    break;
                }
            }
        }
    };

    public void gotoGallery()
    {
        UsageStatistics.instance()
                .changeScreen(NavigationChange.Mode.FILMSTRIP, NavigationChange.InteractionCause.BUTTON);

        mFilmstripController.goToNextItem();
    }

    /**
     * If 'visible' is false, this hides the action bar. Also maintains
     * lights-out at all times.
     *
     * @param visible is false, this hides the action bar and filmstrip bottom
     *                controls.
     */
    private void setFilmstripUiVisibility(boolean visible)
    {
        mLightsOutRunnable.run();
        mCameraAppUI.getFilmstripBottomControls().setVisible(visible);
        if (visible != mActionBar.isShowing())
        {
            if (visible)
            {
                mActionBar.show();
                mCameraAppUI.showBottomControls();
            } else
            {
                mActionBar.hide();
                mCameraAppUI.hideBottomControls();
            }
        }
        mFilmstripCoversPreview = visible;
        updatePreviewVisibility();
    }

    private void hideSessionProgress()
    {
        mCameraAppUI.getFilmstripBottomControls().hideProgress();
    }

    private void showSessionProgress(int messageId)
    {
        CameraAppUI.BottomPanel controls = mCameraAppUI.getFilmstripBottomControls();
        controls.setProgressText(messageId > 0 ? getString(messageId) : "");
        controls.hideControls();
        controls.hideProgressError();
        controls.showProgress();
    }

    private void showProcessError(int messageId)
    {
        mCameraAppUI.getFilmstripBottomControls().showProgressError(messageId > 0 ? getString(messageId) : "");
    }

    private void updateSessionProgress(int progress)
    {
        mCameraAppUI.getFilmstripBottomControls().setProgress(progress);
    }

    private void updateSessionProgressText(int messageId)
    {
        mCameraAppUI.getFilmstripBottomControls().setProgressText(messageId > 0 ? getString(messageId) : "");
    }

    private void setupNfcBeamPush()
    {
        NfcAdapter adapter = NfcAdapter.getDefaultAdapter(mAppContext);
        if (adapter == null)
        {
            return;
        }

        if (!ApiHelper.HAS_SET_BEAM_PUSH_URIS)
        {
            // Disable beaming
            adapter.setNdefPushMessage(null, CameraActivity.this);
            return;
        }

        adapter.setBeamPushUris(null, CameraActivity.this);
        adapter.setBeamPushUrisCallback(new CreateBeamUrisCallback()
        {
            @Override
            public Uri[] createBeamUris(NfcEvent event)
            {
                return mNfcPushUris;
            }
        }, CameraActivity.this);
    }

    @Override
    public boolean onShareTargetSelected(ShareActionProvider shareActionProvider, Intent intent)
    {
        int currentIndex = mFilmstripController.getCurrentAdapterIndex();
        if (currentIndex < 0)
        {
            return false;
        }
        UsageStatistics.instance()
                .mediaInteraction(fileNameFromAdapterAtIndex(currentIndex), MediaInteraction.InteractionType.SHARE,
                        NavigationChange.InteractionCause.BUTTON, fileAgeFromAdapterAtIndex(currentIndex));
        // TODO add intent.getComponent().getPackageName()
        return true;
    }

    // Note: All callbacks come back on the main thread.
    private final SessionListener mSessionListener = new SessionListener()
    {
        @Override
        public void onSessionQueued(final Uri uri)
        {
            Log.v(TAG, "onSessionQueued: " + uri);
            if (!Storage.isSessionUri(uri))
            {
                return;
            }
            Optional<SessionItem> newData = SessionItem.create(getApplicationContext(), uri);
            if (newData.isPresent())
            {
                mDataAdapter.addOrUpdate(newData.get());
            }
        }

        @Override
        public void onSessionUpdated(Uri uri)
        {
            Log.v(TAG, "onSessionUpdated: " + uri);
            mDataAdapter.refresh(uri);
        }

        @Override
        public void onSessionDone(final Uri sessionUri)
        {
            Log.v(TAG, "onSessionDone:" + sessionUri);
            Uri contentUri = Storage.getContentUriForSessionUri(sessionUri);
            if (contentUri == null)
            {
                mDataAdapter.refresh(sessionUri);
                return;
            }
            PhotoItem newData = mPhotoItemFactory.queryContentUri(contentUri);

            // This can be null if e.g. a session is canceled (e.g.
            // through discard panorama). It might be worth adding
            // onSessionCanceled or the like this interface.
            if (newData == null)
            {
                Log.i(TAG, "onSessionDone: Could not find LocalData for URI: " + contentUri);
                return;
            }

            final int pos = mDataAdapter.findByContentUri(sessionUri);
            if (pos == -1)
            {
                // We do not have a placeholder for this image, perhaps
                // due to the activity crashing or being killed.
                mDataAdapter.addOrUpdate(newData);
            } else
            {
                // Make the PhotoItem aware of the session placeholder, to
                // allow it to make a smooth transition to its content if it
                // the session item is currently visible.
                FilmstripItem oldSessionData = mDataAdapter.getFilmstripItemAt(pos);
                if (mCameraAppUI.getFilmstripVisibility() == View.VISIBLE && mFilmstripController.isVisible
                        (oldSessionData))
                {
                    Log.v(TAG, "session item visible, setting transition placeholder");
                    newData.setSessionPlaceholderBitmap(Storage.getPlaceholderForSession(sessionUri));
                }
                mDataAdapter.updateItemAt(pos, newData);
            }
        }

        @Override
        public void onSessionProgress(final Uri uri, final int progress)
        {
            if (progress < 0)
            {
                // Do nothing, there is no task for this URI.
                return;
            }
            int currentIndex = mFilmstripController.getCurrentAdapterIndex();
            if (currentIndex == -1)
            {
                return;
            }
            if (uri.equals(mDataAdapter.getItemAt(currentIndex).getData().getUri()))
            {
                updateSessionProgress(progress);
            }
        }

        @Override
        public void onSessionProgressText(final Uri uri, final int messageId)
        {
            int currentIndex = mFilmstripController.getCurrentAdapterIndex();
            if (currentIndex == -1)
            {
                return;
            }
            if (uri.equals(mDataAdapter.getItemAt(currentIndex).getData().getUri()))
            {
                updateSessionProgressText(messageId);
            }
        }

        @Override
        public void onSessionCaptureIndicatorUpdate(Bitmap indicator, int rotationDegrees)
        {
            // Don't show capture indicator in Photo Sphere.
            final int photosphereModuleId = getApplicationContext().getResources()
                    .getInteger(R.integer.camera_mode_photosphere);
            if (mCurrentModeIndex == photosphereModuleId)
            {
                return;
            }
            indicateCapture(indicator, rotationDegrees);
        }

        @Override
        public void onSessionFailed(Uri uri, int failureMessageId, boolean removeFromFilmstrip)
        {
            Log.v(TAG, "onSessionFailed:" + uri);

            int failedIndex = mDataAdapter.findByContentUri(uri);
            int currentIndex = mFilmstripController.getCurrentAdapterIndex();

            if (currentIndex == failedIndex)
            {
                updateSessionProgress(0);
                showProcessError(failureMessageId);
                mDataAdapter.refresh(uri);
            }
            if (removeFromFilmstrip)
            {
                mFatalErrorHandler.onMediaStorageFailure();
                mDataAdapter.removeAt(failedIndex);
            }
        }

        @Override
        public void onSessionCanceled(Uri uri)
        {
            Log.v(TAG, "onSessionCanceled:" + uri);
            int failedIndex = mDataAdapter.findByContentUri(uri);
            mDataAdapter.removeAt(failedIndex);
        }

        @Override
        public void onSessionThumbnailUpdate(Bitmap bitmap)
        {
        }

        @Override
        public void onSessionPictureDataUpdate(byte[] pictureData, int orientation)
        {
        }
    };

    @Override
    public Context getAndroidContext()
    {
        return mAppContext;
    }

    @Override
    public OneCameraFeatureConfig getCameraFeatureConfig()
    {
        return mFeatureConfig;
    }

    @Override
    public Dialog createDialog()
    {
        return new Dialog(this, android.R.style.Theme_Black_NoTitleBar_Fullscreen);
    }

    @Override
    public void launchActivityByIntent(Intent intent)
    {
        // Starting from L, we prefer not to start edit activity within camera's task.
        mResetToPreviewOnResume = false;
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT);

        startActivity(intent);
    }

    @Override
    public int getCurrentModuleIndex()
    {
        return mCurrentModeIndex;
    }

    @Override
    public String getModuleScope()
    {
        ModuleAgent agent = mModuleManager.getModuleAgent(mCurrentModeIndex);
        return SettingsManager.getModuleSettingScope(agent.getScopeNamespace());
    }

    @Override
    public String getCameraScope()
    {
        // if an unopen camera i.e. negative ID is returned, which we've observed in
        // some automated scenarios, just return it as a valid separate scope
        // this could cause user issues, so log a stack trace noting the call path
        // which resulted in this scenario.

        CameraId cameraId = mCameraController.getCurrentCameraId();

        if (cameraId == null)
        {
            Log.e(TAG, "Retrieving Camera Setting Scope with -1");
            return SettingsManager.getCameraSettingScope("-1");
        }

        return SettingsManager.getCameraSettingScope(cameraId.getValue());
    }

    @Override
    public ModuleController getCurrentModuleController()
    {
        return mCurrentModule;
    }

    @Override
    public int getQuickSwitchToModuleId(int currentModuleIndex)
    {
        return mModuleManager.getQuickSwitchToModuleId(currentModuleIndex, mSettingsManager, mAppContext);
    }

    @Override
    public SurfaceTexture getPreviewBuffer()
    {
        // TODO: implement this
        return null;
    }

    @Override
    public void onPreviewReadyToStart()
    {
        mCameraAppUI.onPreviewReadyToStart();
    }

    @Override
    public void onPreviewStarted()
    {
        mCameraAppUI.onPreviewStarted();
    }

    @Override
    public void addPreviewAreaSizeChangedListener(PreviewStatusListener.PreviewAreaChangedListener listener)
    {
        mCameraAppUI.addPreviewAreaChangedListener(listener);
    }

    @Override
    public void removePreviewAreaSizeChangedListener(PreviewStatusListener.PreviewAreaChangedListener listener)
    {
        mCameraAppUI.removePreviewAreaChangedListener(listener);
    }

    @Override
    public void setupOneShotPreviewListener()
    {
        mCameraController.setOneShotPreviewCallback(mMainHandler, new CameraAgent.CameraPreviewDataCallback()
        {
            @Override
            public void onPreviewFrame(byte[] data, CameraAgent.CameraProxy camera)
            {
                mCurrentModule.onPreviewInitialDataReceived();
                mCameraAppUI.onNewPreviewFrame();
            }
        });
    }

    @Override
    public void updatePreviewAspectRatio(float aspectRatio)
    {
        mCameraAppUI.updatePreviewAspectRatio(aspectRatio);
    }

    @Override
    public void updatePreviewTransformFullscreen(Matrix matrix, float aspectRatio)
    {
        mCameraAppUI.updatePreviewTransformFullscreen(matrix, aspectRatio);
    }

    @Override
    public RectF getFullscreenRect()
    {
        return mCameraAppUI.getFullscreenRect();
    }

    @Override
    public void updatePreviewTransform(Matrix matrix)
    {
        mCameraAppUI.updatePreviewTransform(matrix);
    }

    @Override
    public void setPreviewStatusListener(PreviewStatusListener previewStatusListener)
    {
        mCameraAppUI.setPreviewStatusListener(previewStatusListener);
    }

    @Override
    public FrameLayout getModuleLayoutRoot()
    {
        return mCameraAppUI.getModuleRootView();
    }

    @Override
    public void setShutterEventsListener(ShutterEventsListener listener)
    {
        // TODO: implement this
    }

    @Override
    public void setShutterEnabled(boolean enabled)
    {
        mCameraAppUI.setShutterButtonEnabled(enabled);
    }

    @Override
    public boolean isShutterEnabled()
    {
        return mCameraAppUI.isShutterButtonEnabled();
    }

    @Override
    public void startFlashAnimation(boolean shortFlash)
    {
        mCameraAppUI.startFlashAnimation(shortFlash);
    }

    @Override
    public void startPreCaptureAnimation()
    {
        // TODO: implement this
    }

    @Override
    public void cancelPreCaptureAnimation()
    {
        // TODO: implement this
    }

    @Override
    public void startPostCaptureAnimation()
    {
        // TODO: implement this
    }

    @Override
    public void startPostCaptureAnimation(Bitmap thumbnail)
    {
        // TODO: implement this
    }

    @Override
    public void cancelPostCaptureAnimation()
    {
        // TODO: implement this
    }

    @Override
    public OrientationManager getOrientationManager()
    {
        return mOrientationManager;
    }

    @Override
    public LocationManager getLocationManager()
    {
        return mLocationManager;
    }

    @Override
    public void lockOrientation()
    {
        if (mOrientationManager != null)
        {
            mOrientationManager.lockOrientation();
        }
    }

    @Override
    public void unlockOrientation()
    {
        if (mOrientationManager != null)
        {
            mOrientationManager.unlockOrientation();
        }
    }

    /**
     * If not in filmstrip, this shows the capture indicator.
     */
    private void indicateCapture(final Bitmap indicator, final int rotationDegrees)
    {
        if (mFilmstripVisible)
        {
            return;
        }

        // Don't show capture indicator in Photo Sphere.
        // TODO: Don't reach into resources to figure out the current mode.
        final int photosphereModuleId = getApplicationContext().getResources()
                .getInteger(R.integer.camera_mode_photosphere);
        if (mCurrentModeIndex == photosphereModuleId)
        {
            return;
        }

        mMainHandler.post(new Runnable()
        {
            @Override
            public void run()
            {
                mCameraAppUI.startCaptureIndicatorRevealAnimation(mCurrentModule.getPeekAccessibilityString());
                mCameraAppUI.updateCaptureIndicatorThumbnail(indicator, rotationDegrees);
            }
        });
    }

    @Override
    public void notifyNewMedia(Uri uri)
    {
        // TODO: This method is running on the main thread. Also we should get
        // rid of that AsyncTask.

        updateStorageSpaceAndHint(null);
        ContentResolver cr = getContentResolver();
        String mimeType = cr.getType(uri);
        FilmstripItem newData = null;
        if (FilmstripItemUtils.isMimeTypeVideo(mimeType))
        {
            sendBroadcast(new Intent(CameraUtil.ACTION_NEW_VIDEO, uri));
            newData = mVideoItemFactory.queryContentUri(uri);
            if (newData == null)
            {
                Log.e(TAG, "Can't find video data in content resolver:" + uri);
                return;
            }
        } else if (FilmstripItemUtils.isMimeTypeImage(mimeType))
        {
            CameraUtil.broadcastNewPicture(mAppContext, uri);
            newData = mPhotoItemFactory.queryContentUri(uri);
            if (newData == null)
            {
                Log.e(TAG, "Can't find photo data in content resolver:" + uri);
                return;
            }
        } else
        {
            Log.w(TAG, "Unknown new media with MIME type:" + mimeType + ", uri:" + uri);
            return;
        }

        // We are preloading the metadata for new video since we need the
        // rotation info for the thumbnail.
        new AsyncTask<FilmstripItem, Void, FilmstripItem>()
        {
            @Override
            protected FilmstripItem doInBackground(FilmstripItem... params)
            {
                FilmstripItem data = params[0];
                MetadataLoader.loadMetadata(getAndroidContext(), data);
                return data;
            }

            @Override
            protected void onPostExecute(final FilmstripItem data)
            {
                // TODO: Figure out why sometimes the data is aleady there.
                mDataAdapter.addOrUpdate(data);

                // Legacy modules don't use CaptureSession, so we show the capture indicator when
                // the item was safed.
                if (mCurrentModule instanceof PhotoModule || mCurrentModule instanceof VideoModule)
                {
                    AsyncTask.THREAD_POOL_EXECUTOR.execute(new Runnable()
                    {
                        @Override
                        public void run()
                        {
                            final Optional<Bitmap> bitmap = data.generateThumbnail(mAboveFilmstripControlLayout
                                    .getWidth(), mAboveFilmstripControlLayout
                                    .getMeasuredHeight());
                            if (bitmap.isPresent())
                            {
                                indicateCapture(bitmap.get(), 0);
                            }
                        }
                    });
                }
            }
        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, newData);
    }

    @Override
    public void enableKeepScreenOn(boolean enabled)
    {
        if (mPaused)
        {
            return;
        }

        mKeepScreenOn = enabled;
        if (mKeepScreenOn)
        {
            mMainHandler.removeMessages(MSG_CLEAR_SCREEN_ON_FLAG);
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        } else
        {
            keepScreenOnForAWhile();
        }
    }

    @Override
    public CameraProvider getCameraProvider()
    {
        return mCameraController;
    }

    @Override
    public OneCameraOpener getCameraOpener()
    {
        return mOneCameraOpener;
    }

    private void removeItemAt(int index)
    {
        mDataAdapter.removeAt(index);
        if (mDataAdapter.getTotalNumber() > 0)
        {
            showUndoDeletionBar();
        } else
        {
            // If camera preview is the only view left in filmstrip,
            // no need to show undo bar.
            mPendingDeletion = true;
            performDeletion();
            if (mFilmstripVisible)
            {
                mCameraAppUI.getFilmstripContentPanel().animateHide();
            }
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        // Handle presses on the action bar items
        switch (item.getItemId())
        {
            case android.R.id.home:
                onBackPressed();
                return true;
            case R.id.action_details:
                showDetailsDialog(mFilmstripController.getCurrentAdapterIndex());
                return true;
            case R.id.action_help_and_feedback:
                mResetToPreviewOnResume = false;
                new GoogleHelpHelper(this).launchGoogleHelp();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private boolean isCaptureIntent()
    {
        if (MediaStore.ACTION_VIDEO_CAPTURE.equals(getIntent().getAction()) || MediaStore.ACTION_IMAGE_CAPTURE.equals
                (getIntent()
                        .getAction()) || MediaStore.ACTION_IMAGE_CAPTURE_SECURE.equals(getIntent().getAction()))
        {
            return true;
        } else
        {
            return false;
        }
    }

    /**
     * Note: Make sure this callback is unregistered properly when the activity
     * is destroyed since we're otherwise leaking the Activity reference.
     */
    private final CameraExceptionHandler.CameraExceptionCallback mCameraExceptionCallback = new
            CameraExceptionHandler.CameraExceptionCallback()
            {
                @Override
                public void onCameraError(int errorCode)
                {
                    // Not a fatal error. only do Log.e().
                    Log.e(TAG, "Camera error callback. error=" + errorCode);
                }

                @Override
                public void onCameraException(RuntimeException ex, String commandHistory, int action, int state)
                {
                    Log.e(TAG, "Camera Exception", ex);
                    UsageStatistics.instance()
                            .cameraFailure(eventprotos.CameraFailure.FailureReason.API_RUNTIME_EXCEPTION,
                                    commandHistory,
                                    action, state);
                    onFatalError();
                }

                @Override
                public void onDispatchThreadException(RuntimeException ex)
                {
                    Log.e(TAG, "DispatchThread Exception", ex);
                    UsageStatistics.instance()
                            .cameraFailure(eventprotos.CameraFailure.FailureReason.API_TIMEOUT, null, UsageStatistics
                                            .NONE,
                                    UsageStatistics.NONE);
                    onFatalError();
                }

                private void onFatalError()
                {
                    if (mCameraFatalError)
                    {
                        return;
                    }
                    mCameraFatalError = true;

                    // If the activity receives exception during onPause, just exit the app.
                    if (mPaused && !isFinishing())
                    {
                        Log.e(TAG, "Fatal error during onPause, call Activity.finish()");
                        finish();
                    } else
                    {
                        mFatalErrorHandler.handleFatalError(FatalErrorHandler.Reason.CANNOT_CONNECT_TO_CAMERA);
                    }
                }
            };

    @Override
    public void onNewIntentTasks(Intent intent)
    {
        onModeSelected(getModeIndex());
    }

    @Override
    public void onCreateTasks(Bundle state)
    {
        Profile profile = mProfiler.create("CameraActivity.onCreateTasks").start();
        CameraPerformanceTracker.onEvent(CameraPerformanceTracker.ACTIVITY_START);

        mOnCreateTime = System.currentTimeMillis();

        mAppContext = getApplicationContext();
        mMainHandler = new MainHandler(this, getMainLooper());

        mLocationManager = new LocationManager(mAppContext);
        mOrientationManager = new OrientationManagerImpl(this, mMainHandler);

        mSettingsManager = getServices().getSettingsManager();

        mSoundPlayer = new SoundPlayer(mAppContext);

        // 该手机上相机支持的features
        mFeatureConfig = OneCameraFeatureConfigCreator.createDefault(getContentResolver(), getServices()
                .getMemoryManager());

        // 错误提示helper
        mFatalErrorHandler = new FatalErrorHandlerImpl(this);

        // 权限申请（没有权限 拉起PermissionActivity, finishSelf）
        checkPermissions();
        if (!mHasCriticalPermissions)
        {
            Log.v(TAG, "onCreate: Missing critical permissions.");
            finish();
            return;
        }
        // 耗时检测
        profile.mark();

        if (!Glide.isSetup())
        {
            Context context = getAndroidContext();
            Glide.setup(new GlideBuilder(context).setDecodeFormat(DecodeFormat.ALWAYS_ARGB_8888)
                    .setResizeService(new FifoPriorityThreadPoolExecutor(2)));

            Glide glide = Glide.get(context);

            // As a camera we will use a large amount of memory
            // for displaying images.
            glide.setMemoryCategory(MemoryCategory.HIGH);
        }
        profile.mark("Glide.setup");

        // 追踪正在使用的相机
        mActiveCameraDeviceTracker = ActiveCameraDeviceTracker.instance();
        try
        {
            // API >= 21, 返回Camera2Impl, 否则throw Exp
            mOneCameraOpener = OneCameraModule.provideOneCameraOpener(mFeatureConfig, mAppContext,
                    mActiveCameraDeviceTracker, ResolutionUtil
                            .getDisplayMetrics(this));
            mOneCameraManager = OneCameraModule.provideOneCameraManager();
        } catch (OneCameraException e)
        {
            // Log error and continue start process while showing error dialog..
            Log.e(TAG, "Creating camera manager failed.", e);
            mFatalErrorHandler.onGenericCameraAccessFailure();
        }
        profile.mark("OneCameraManager.get");

        try
        {
            // 第二个参数： 打开相机的回调
            // 第四个参数： Camera1Impl
            // 第五个参数： Camera2Impl
            mCameraController = new CameraController(mAppContext, this, mMainHandler, CameraAgentFactory
                    .getAndroidCameraAgent(mAppContext, CameraAgentFactory.CameraApi.API_1), CameraAgentFactory
                    .getAndroidCameraAgent(mAppContext, CameraAgentFactory.CameraApi.AUTO), mActiveCameraDeviceTracker);
            // 相机错误抛给mMainHandler
            mCameraController.setCameraExceptionHandler(new CameraExceptionHandler(mCameraExceptionCallback,
                    mMainHandler));
        } catch (AssertionError e)
        {
            Log.e(TAG, "Creating camera controller failed.", e);
            mFatalErrorHandler.onGenericCameraAccessFailure();
        }

        // TODO: Try to move all the resources allocation to happen as soon as
        // possible so we can call module.init() at the earliest time.
        // 管理相机模式
        mModuleManager = new ModuleManagerImpl();
        // 注册并初始默认相机模式
        ModulesInfo.setupModules(mAppContext, mModuleManager, mFeatureConfig);

        // App升级
        AppUpgrader appUpgrader = new AppUpgrader(this);
        appUpgrader.upgrade(mSettingsManager);

        // Make sure the picture sizes are correctly cached for the current OS
        // version.
        profile.mark();
        try
        {
            PictureSizeLoader pictureSizeLoader = new PictureSizeLoader(mAppContext);
            // 初始化相机支持的拍照分辨率、视频录制分辨率
            pictureSizeLoader.computePictureSizes();
            pictureSizeLoader.release();
        } catch (AssertionError e)
        {
            Log.e(TAG, "Creating camera controller failed.", e);
            mFatalErrorHandler.onGenericCameraAccessFailure();
        }
        profile.mark("computePictureSizes");

        // 初始化设置
        Keys.setDefaults(mSettingsManager, mAppContext);

        mResolutionSetting = new ResolutionSetting(mSettingsManager, mOneCameraManager, getContentResolver());

        getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
        // We suppress this flag via theme when drawing the system preview
        // background, but once we create activity here, reactivate to the
        // default value. The default is important for L, we don't want to
        // change app behavior, just starting background drawable layout.
        if (ApiHelper.isLOrHigher())
        {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        }

        profile.mark();

        setContentView(R.layout.activity_main);
        profile.mark("setContentView()");

        // A window background is set in styles.xml for the system to show a
        // drawable background with gray color and camera icon before the
        // activity is created. We set the background to null here to prevent
        // overdraw, all views must take care of drawing backgrounds if
        // necessary. This call to setBackgroundDrawable must occur after
        // setContentView, otherwise a background may be set again from the
        // style.
        // 优化过度绘制
        getWindow().setBackgroundDrawable(null);

        mActionBar = getActionBar();
        // set actionbar background to 100% or 50% transparent
        if (ApiHelper.isLOrHigher())
        {
            mActionBar.setBackgroundDrawable(new ColorDrawable(0x00000000));
        } else
        {
            mActionBar.setBackgroundDrawable(new ColorDrawable(0x80000000));
        }

        // 上下滑动切换相机模式的控件，使用avd预览该控件效果
        mModeListView = (ModeListView) findViewById(R.id.mode_list_layout);
        mModeListView.init(mModuleManager.getSupportedModeIndexList());

        // 窗口旋转动画
        if (ApiHelper.HAS_ROTATION_ANIMATION)
        {
            setRotationAnimation();
        }

        // 可见性监听：
        // 1. 向右滑动：打开相机模式切换，覆盖在预览画面上方，对应 VISIBILITY_COVERED;
        // 2. 向左滑动：打开相机历史，并隐藏预览画面，对应 VISIBILITY_HIDDEN;
        // 3. 初始状态: 不显示相机模式切换、相机历史，对应 VISIBILITY_VISIBLE;
        mModeListView.setVisibilityChangedListener(new ModeListVisibilityChangedListener()
        {
            @Override
            public void onVisibilityChanged(boolean visible)
            {
                mModeListVisible = visible;
                mCameraAppUI.setShutterButtonImportantToA11y(!visible);
                updatePreviewVisibility();
            }
        });

        // Check if this is in the secure camera mode.
        Intent intent = getIntent();
        String action = intent.getAction();
        if (INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE.equals(action) || ACTION_IMAGE_CAPTURE_SECURE.equals(action))
        {
            mSecureCamera = true;
        } else
        {
            mSecureCamera = intent.getBooleanExtra(SECURE_CAMERA_EXTRA, false);
        }

        // 监听灭屏、解锁的广播，以finish锁屏上的相机页面
        if (mSecureCamera)
        {
            // Change the window flags so that secure camera can show when
            // locked
            Window win = getWindow();
            WindowManager.LayoutParams params = win.getAttributes();
            params.flags |= WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;
            win.setAttributes(params);

            // Filter for screen off so that we can finish secure camera
            // activity when screen is off.
            IntentFilter filter_screen_off = new IntentFilter(Intent.ACTION_SCREEN_OFF);
            registerReceiver(mShutdownReceiver, filter_screen_off);

            // Filter for phone unlock so that we can finish secure camera
            // via this UI path:
            //    1. from secure lock screen, user starts secure camera
            //    2. user presses home button
            //    3. user unlocks phone
            IntentFilter filter_user_unlock = new IntentFilter(Intent.ACTION_USER_PRESENT);
            registerReceiver(mShutdownReceiver, filter_user_unlock);
        }

        // 初始化根布局管理器
        // Google 这个时候还没有mvp、mvvm的架构，所以只是根据class职责单一原则进行架构。
        // XxxModule相当于不同的相机模式Presenter，XxxUI相当于Presenter对应的View。
        // CameraModule、CameraUI则是App级别的资源Holder，所有Module都可以访问。
        // 因为Camera2所有的控件都没有使用support或者design库里面的控件，那个时候也没有，所以显的比较复杂。
        // 另外，由于相机的api调用需要运行在子线程，相机本身又是整个OS共享的，所以调用相机接口前，需要先lock相机。
        // 如果lock失败，则需要等待其它进程释放相机。所以还需要一个线程，用于相机资源同步。
        mCameraAppUI = new CameraAppUI(this, (MainActivityLayout) findViewById(R.id.activity_root_view),
                isCaptureIntent());
        // 相机历史页面触摸事件监听
        mCameraAppUI.setFilmstripBottomControlsListener(mMyFilmstripBottomControlListener);

        // 相机历史的父布局，实现自动打开动画、关闭监听等
        mAboveFilmstripControlLayout = (FrameLayout) findViewById(R.id.camera_filmstrip_content_layout);

        // Add the session listener so we can track the session progress
        // updates.
        getServices().getCaptureSessionManager().addSessionListener(mSessionListener);

        // 相机历史控件，效果类似Gallery
        mFilmstripController = ((FilmstripView) findViewById(R.id.filmstrip_view)).getController();
        // 设置间隔
        mFilmstripController.setImageGap(getResources().getDimensionPixelSize(R.dimen.camera_film_strip_gap));
        profile.mark("Configure Camera UI");

        // 全景相机，没啥用
        mPanoramaViewHelper = new PanoramaViewHelper(this);
        mPanoramaViewHelper.onCreate();

        // 相机历史缩略图加载器
        GlideFilmstripManager glideManager = new GlideFilmstripManager(mAppContext);
        ContentResolver appContentResolver = mAppContext.getContentResolver();
        mPhotoItemFactory = new PhotoItemFactory(mAppContext, glideManager, appContentResolver, new PhotoDataFactory());
        mVideoItemFactory = new VideoItemFactory(mAppContext, glideManager, appContentResolver, new VideoDataFactory());

        // 监听相机历史面板打开关闭
        mCameraAppUI.getFilmstripContentPanel().setFilmstripListener(mFilmstripListener);
        if (mSettingsManager.getBoolean(SettingsManager.SCOPE_GLOBAL, Keys.KEY_SHOULD_SHOW_REFOCUS_VIEWER_CLING))
        {
            mCameraAppUI.setupClingForViewer(CameraAppUI.BottomPanel.VIEWER_REFOCUS);
        }

        // 初始化当前相机模式
        setModuleFromModeIndex(getModeIndex());

        profile.mark();
        // 初始化所有Module共享的View控件
        mCameraAppUI.prepareModuleUI();
        profile.mark("Init Current Module UI");

        // 初始化当前相机模式，并创建对应的UI管理器
        mCurrentModule.init(this, isSecureCamera(), isCaptureIntent());
        profile.mark("Init CurrentModule");

        // 预加载相册
        preloadFilmstripItems();

        setupNfcBeamPush();

        mLocalImagesObserver = new FilmstripContentObserver();
        mLocalVideosObserver = new FilmstripContentObserver();

        getContentResolver().registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true,
                mLocalImagesObserver);
        getContentResolver().registerContentObserver(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, true,
                mLocalVideosObserver);

        mMemoryManager = getServices().getMemoryManager();

        AsyncTask.THREAD_POOL_EXECUTOR.execute(new Runnable()
        {
            @Override
            public void run()
            {
                HashMap memoryData = mMemoryManager.queryMemory();
                UsageStatistics.instance().reportMemoryConsumed(memoryData, MemoryQuery.REPORT_LABEL_LAUNCH);
            }
        });

        mMotionManager = getServices().getMotionManager();

        mFirstRunDialog = new FirstRunDialog(this, this /* as context */, mResolutionSetting, mSettingsManager,
                mOneCameraManager, new FirstRunDialog.FirstRunDialogListener()
        {
            @Override
            public void onFirstRunStateReady()
            {
                // Run normal resume tasks.
                resume();
            }

            @Override
            public void onFirstRunDialogCancelled()
            {
                // App isn't functional until users finish first run dialog.
                // We need to finish here since users hit back button during
                // first run dialog (b/19593942).
                finish();
            }

            @Override
            public void onCameraAccessException()
            {
                mFatalErrorHandler.onGenericCameraAccessFailure();
            }
        });
        profile.stop();
    }

    /**
     * Get the current mode index from the Intent or from persistent
     * settings.
     */
    private int getModeIndex()
    {
        int modeIndex = -1;
        int photoIndex = getResources().getInteger(R.integer.camera_mode_photo);
        int videoIndex = getResources().getInteger(R.integer.camera_mode_video);
        int gcamIndex = getResources().getInteger(R.integer.camera_mode_gcam);
        int captureIntentIndex = getResources().getInteger(R.integer.camera_mode_capture_intent);
        String intentAction = getIntent().getAction();
        if (MediaStore.INTENT_ACTION_VIDEO_CAMERA.equals(intentAction) || MediaStore.ACTION_VIDEO_CAPTURE.equals
                (intentAction))
        {
            modeIndex = videoIndex;
        } else if (MediaStore.ACTION_IMAGE_CAPTURE.equals(intentAction) || MediaStore.ACTION_IMAGE_CAPTURE_SECURE
                .equals(intentAction))
        {
            // Capture intent.
            modeIndex = captureIntentIndex;
        } else if (MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA.equals(intentAction) || MediaStore
                .INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE
                .equals(intentAction) || MediaStore.ACTION_IMAGE_CAPTURE_SECURE.equals(intentAction))
        {
            modeIndex = mSettingsManager.getInteger(SettingsManager.SCOPE_GLOBAL, Keys.KEY_CAMERA_MODULE_LAST_USED);

            // For upgraders who have not seen the aspect ratio selection screen,
            // we need to drop them back in the photo module and have them select
            // aspect ratio.
            // TODO: Move this to SettingsManager as an upgrade procedure.
            if (!mSettingsManager.getBoolean(SettingsManager.SCOPE_GLOBAL, Keys.KEY_USER_SELECTED_ASPECT_RATIO))
            {
                modeIndex = photoIndex;
            }
        } else
        {
            // If the activity has not been started using an explicit intent,
            // read the module index from the last time the user changed modes
            modeIndex = mSettingsManager.getInteger(SettingsManager.SCOPE_GLOBAL, Keys.KEY_STARTUP_MODULE_INDEX);
            if ((modeIndex == gcamIndex && !GcamHelper.hasGcamAsSeparateModule(mFeatureConfig)) || modeIndex < 0)
            {
                modeIndex = photoIndex;
            }
        }
        return modeIndex;
    }

    /**
     * Call this whenever the mode drawer or filmstrip change the visibility
     * state.
     */
    private void updatePreviewVisibility()
    {
        if (mCurrentModule == null)
        {
            return;
        }

        int visibility = getPreviewVisibility();
        mCameraAppUI.onPreviewVisiblityChanged(visibility);
        updatePreviewRendering(visibility);
        mCurrentModule.onPreviewVisibilityChanged(visibility);
    }

    private void updatePreviewRendering(int visibility)
    {
        if (visibility == ModuleController.VISIBILITY_HIDDEN)
        {
            mCameraAppUI.pausePreviewRendering();
        } else
        {
            mCameraAppUI.resumePreviewRendering();
        }
    }

    private int getPreviewVisibility()
    {
        if (mFilmstripCoversPreview)
        {
            return ModuleController.VISIBILITY_HIDDEN;
        } else if (mModeListVisible)
        {
            return ModuleController.VISIBILITY_COVERED;
        } else
        {
            return ModuleController.VISIBILITY_VISIBLE;
        }
    }

    private void setRotationAnimation()
    {
        int rotationAnimation = WindowManager.LayoutParams.ROTATION_ANIMATION_ROTATE;
        rotationAnimation = WindowManager.LayoutParams.ROTATION_ANIMATION_CROSSFADE;
        Window win = getWindow();
        WindowManager.LayoutParams winParams = win.getAttributes();
        winParams.rotationAnimation = rotationAnimation;
        win.setAttributes(winParams);
    }

    @Override
    public void onUserInteraction()
    {
        super.onUserInteraction();
        if (!isFinishing())
        {
            keepScreenOnForAWhile();
        }
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev)
    {
        boolean result = super.dispatchTouchEvent(ev);
        if (ev.getActionMasked() == MotionEvent.ACTION_DOWN)
        {
            // Real deletion is postponed until the next user interaction after
            // the gesture that triggers deletion. Until real deletion is
            // performed, users can click the undo button to bring back the
            // image that they chose to delete.
            if (mPendingDeletion && !mIsUndoingDeletion)
            {
                performDeletion();
            }
        }
        return result;
    }

    @Override
    public void onPauseTasks()
    {
        CameraPerformanceTracker.onEvent(CameraPerformanceTracker.ACTIVITY_PAUSE);
        Profile profile = mProfiler.create("CameraActivity.onPause").start();

        /*
         * Save the last module index after all secure camera and icon launches,
         * not just on mode switches.
         *
         * Right now we exclude capture intents from this logic, because we also
         * ignore the cross-Activity recovery logic in onStart for capture intents.
         */
        if (!isCaptureIntent())
        {
            mSettingsManager.set(SettingsManager.SCOPE_GLOBAL, Keys.KEY_STARTUP_MODULE_INDEX, mCurrentModeIndex);
        }

        mPaused = true;
        mCameraAppUI.hideCaptureIndicator();
        mFirstRunDialog.dismiss();

        // Delete photos that are pending deletion
        performDeletion();
        mCurrentModule.pause();
        mOrientationManager.pause();
        mPanoramaViewHelper.onPause();

        mLocalImagesObserver.setForegroundChangeListener(null);
        mLocalImagesObserver.setActivityPaused(true);
        mLocalVideosObserver.setActivityPaused(true);
        if (mPreloader != null)
        {
            mPreloader.cancelAllLoads();
        }
        resetScreenOn();

        mMotionManager.stop();

        // Always stop recording location when paused. Resume will start
        // location recording again if the location setting is on.
        mLocationManager.recordLocation(false);

        UsageStatistics.instance().backgrounded();

        // Camera is in fatal state. A fatal dialog is presented to users, but users just hit home
        // button. Let's just kill the process.
        if (mCameraFatalError && !isFinishing())
        {
            Log.v(TAG, "onPause when camera is in fatal state, call Activity.finish()");
            finish();
        } else
        {
            // Close the camera and wait for the operation done.
            Log.v(TAG, "onPause closing camera");
            if (mCameraController != null)
            {
                mCameraController.closeCamera(true);
            }
        }

        profile.stop();
    }

    @Override
    public void onResumeTasks()
    {
        mPaused = false;
        checkPermissions();
        if (!mHasCriticalPermissions)
        {
            Log.v(TAG, "onResume: Missing critical permissions.");
            finish();
            return;
        }
        if (!isSecureCamera() && !isCaptureIntent())
        {
            // Show the dialog if necessary. The rest resume logic will be invoked
            // at the onFirstRunStateReady() callback.
            try
            {
                mFirstRunDialog.showIfNecessary();
            } catch (AssertionError e)
            {
                Log.e(TAG, "Creating camera controller failed.", e);
                mFatalErrorHandler.onGenericCameraAccessFailure();
            }
        } else
        {
            // In secure mode from lockscreen, we go straight to camera and will
            // show first run dialog next time user enters launcher.
            Log.v(TAG, "in secure mode, skipping first run dialog check");
            resume();
        }
    }

    /**
     * Checks if any of the needed Android runtime permissions are missing.
     * If they are, then launch the permissions activity under one of the following conditions:
     * a) The permissions dialogs have not run yet. We will ask for permission only once.
     * b) If the missing permissions are critical to the app running, we will display a fatal error dialog.
     * Critical permissions are: camera, microphone and storage. The app cannot run without them.
     * Non-critical permission is location.
     */
    private void checkPermissions()
    {
        if (!ApiHelper.isMOrHigher())
        {
            Log.v(TAG, "not running on M, skipping permission checks");
            mHasCriticalPermissions = true;
            return;
        }

        if (checkSelfPermission(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED &&
                checkSelfPermission(Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED &&
                checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
        {
            mHasCriticalPermissions = true;
        } else
        {
            mHasCriticalPermissions = false;
        }

        if ((checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                !mSettingsManager
                        .getBoolean(SettingsManager.SCOPE_GLOBAL, Keys.KEY_HAS_SEEN_PERMISSIONS_DIALOGS)) ||
                !mHasCriticalPermissions)
        {
            Intent intent = new Intent(this, PermissionsActivity.class);
            startActivity(intent);
            finish();
        }
    }

    private void preloadFilmstripItems()
    {
        if (mDataAdapter == null)
        {
            mDataAdapter = new CameraFilmstripDataAdapter(mAppContext, mPhotoItemFactory, mVideoItemFactory);
            mDataAdapter.setLocalDataListener(mFilmstripItemListener);
            mPreloader = new Preloader<Integer, AsyncTask>(FILMSTRIP_PRELOAD_AHEAD_ITEMS, mDataAdapter, mDataAdapter);
            if (!mSecureCamera)
            {
                mFilmstripController.setDataAdapter(mDataAdapter);
                if (!isCaptureIntent())
                {
                    mDataAdapter.requestLoad(new Callback<Void>()
                    {
                        @Override
                        public void onCallback(Void result)
                        {
                            fillTemporarySessions();
                        }
                    });
                }
            } else
            {
                // Put a lock placeholder as the last image by setting its date to
                // 0.
                ImageView v = (ImageView) getLayoutInflater().inflate(R.layout.secure_album_placeholder, null);
                v.setTag(R.id.mediadata_tag_viewtype, FilmstripItemType.SECURE_ALBUM_PLACEHOLDER.ordinal());
                v.setOnClickListener(new View.OnClickListener()
                {
                    @Override
                    public void onClick(View view)
                    {
                        UsageStatistics.instance()
                                .changeScreen(NavigationChange.Mode.GALLERY, NavigationChange.InteractionCause.BUTTON);
                        startGallery();
                        finish();
                    }
                });
                v.setContentDescription(getString(R.string.accessibility_unlock_to_camera));
                mDataAdapter = new FixedLastProxyAdapter(mAppContext, mDataAdapter, new PlaceholderItem(v,
                        FilmstripItemType.SECURE_ALBUM_PLACEHOLDER, v
                        .getDrawable()
                        .getIntrinsicWidth(), v.getDrawable().getIntrinsicHeight()));
                // Flush out all the original data.
                mDataAdapter.clear();
                mFilmstripController.setDataAdapter(mDataAdapter);
            }
        }
    }

    private void resume()
    {
        Profile profile = mProfiler.create("CameraActivity.resume").start();
        CameraPerformanceTracker.onEvent(CameraPerformanceTracker.ACTIVITY_RESUME);
        Log.v(TAG, "Build info: " + Build.DISPLAY);
        updateStorageSpaceAndHint(null);

        mLastLayoutOrientation = getResources().getConfiguration().orientation;

        // TODO: Handle this in OrientationManager.
        // Auto-rotate off
        if (Settings.System.getInt(getContentResolver(), Settings.System.ACCELEROMETER_ROTATION, 0) == 0)
        {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
            mAutoRotateScreen = false;
        } else
        {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
            mAutoRotateScreen = true;
        }

        // Foreground event logging.  ACTION_STILL_IMAGE_CAMERA and
        // INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE are double logged due to
        // lockscreen onResume->onPause->onResume sequence.
        int source;
        String action = getIntent().getAction();
        if (action == null)
        {
            source = ForegroundSource.UNKNOWN_SOURCE;
        } else
        {
            switch (action)
            {
                case MediaStore.ACTION_IMAGE_CAPTURE:
                    source = ForegroundSource.ACTION_IMAGE_CAPTURE;
                    break;
                case MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA:
                    // was UNKNOWN_SOURCE in Fishlake.
                    source = ForegroundSource.ACTION_STILL_IMAGE_CAMERA;
                    break;
                case MediaStore.INTENT_ACTION_VIDEO_CAMERA:
                    // was UNKNOWN_SOURCE in Fishlake.
                    source = ForegroundSource.ACTION_VIDEO_CAMERA;
                    break;
                case MediaStore.ACTION_VIDEO_CAPTURE:
                    source = ForegroundSource.ACTION_VIDEO_CAPTURE;
                    break;
                case MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE:
                    // was ACTION_IMAGE_CAPTURE_SECURE in Fishlake.
                    source = ForegroundSource.ACTION_STILL_IMAGE_CAMERA_SECURE;
                    break;
                case MediaStore.ACTION_IMAGE_CAPTURE_SECURE:
                    source = ForegroundSource.ACTION_IMAGE_CAPTURE_SECURE;
                    break;
                case Intent.ACTION_MAIN:
                    source = ForegroundSource.ACTION_MAIN;
                    break;
                default:
                    source = ForegroundSource.UNKNOWN_SOURCE;
                    break;
            }
        }
        UsageStatistics.instance()
                .foregrounded(source, currentUserInterfaceMode(), isKeyguardSecure(), isKeyguardLocked(),
                        mStartupOnCreate, mExecutionStartNanoTime);

        mGalleryIntent = IntentHelper.getGalleryIntent(mAppContext);
        if (ApiHelper.isLOrHigher())
        {
            // hide the up affordance for L devices, it's not very Materially
            mActionBar.setDisplayShowHomeEnabled(false);
        }

        mOrientationManager.resume();

        mCurrentModule.hardResetSettings(mSettingsManager);

        profile.mark();
        mCurrentModule.resume();
        UsageStatistics.instance().changeScreen(currentUserInterfaceMode(), NavigationChange.InteractionCause.BUTTON);
        setSwipingEnabled(true);
        profile.mark("mCurrentModule.resume");

        if (!mResetToPreviewOnResume)
        {
            FilmstripItem item = mDataAdapter.getItemAt(mFilmstripController.getCurrentAdapterIndex());
            if (item != null)
            {
                mDataAdapter.refresh(item.getData().getUri());
            }
        }

        // The share button might be disabled to avoid double tapping.
        mCameraAppUI.getFilmstripBottomControls().setShareEnabled(true);
        // Default is showing the preview, unless disabled by explicitly
        // starting an activity we want to return from to the filmstrip rather
        // than the preview.
        mResetToPreviewOnResume = true;

        if (mLocalVideosObserver.isMediaDataChangedDuringPause() || mLocalImagesObserver
                .isMediaDataChangedDuringPause())
        {
            if (!mSecureCamera)
            {
                // If it's secure camera, requestLoad() should not be called
                // as it will load all the data.
                if (!mFilmstripVisible)
                {
                    mDataAdapter.requestLoad(new Callback<Void>()
                    {
                        @Override
                        public void onCallback(Void result)
                        {
                            fillTemporarySessions();
                        }
                    });
                } else
                {
                    mDataAdapter.requestLoadNewPhotos();
                }
            }
        }
        mLocalImagesObserver.setActivityPaused(false);
        mLocalVideosObserver.setActivityPaused(false);
        if (!mSecureCamera)
        {
            mLocalImagesObserver.setForegroundChangeListener(new FilmstripContentObserver.ChangeListener()
            {
                @Override
                public void onChange()
                {
                    mDataAdapter.requestLoadNewPhotos();
                }
            });
        }

        keepScreenOnForAWhile();

        // Lights-out mode at all times.
        final View rootView = findViewById(R.id.activity_root_view);
        mLightsOutRunnable.run();
        getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(new OnSystemUiVisibilityChangeListener()
        {
            @Override
            public void onSystemUiVisibilityChange(int visibility)
            {
                mMainHandler.removeCallbacks(mLightsOutRunnable);
                mMainHandler.postDelayed(mLightsOutRunnable, LIGHTS_OUT_DELAY_MS);
            }
        });

        profile.mark();
        mPanoramaViewHelper.onResume();
        profile.mark("mPanoramaViewHelper.onResume()");

        ReleaseHelper.showReleaseInfoDialogOnStart(this, mSettingsManager);
        // Enable location recording if the setting is on.
        final boolean locationRecordingEnabled = mSettingsManager.getBoolean(SettingsManager.SCOPE_GLOBAL, Keys
                .KEY_RECORD_LOCATION);
        mLocationManager.recordLocation(locationRecordingEnabled);

        final int previewVisibility = getPreviewVisibility();
        updatePreviewRendering(previewVisibility);

        mMotionManager.start();
        profile.stop();
    }

    private void fillTemporarySessions()
    {
        if (mSecureCamera)
        {
            return;
        }
        // There might be sessions still in flight (processed by our service).
        // Make sure they're added to the filmstrip.
        getServices().getCaptureSessionManager().fillTemporarySession(mSessionListener);
    }

    @Override
    public void onStartTasks()
    {
        mIsActivityRunning = true;
        mPanoramaViewHelper.onStart();

        /*
         * If we're starting after launching a different Activity (lockscreen),
         * we need to use the last mode used in the other Activity, and
         * not the old one from this Activity.
         *
         * This needs to happen before CameraAppUI.resume() in order to set the
         * mode cover icon to the actual last mode used.
         *
         * Right now we exclude capture intents from this logic.
         */
        int modeIndex = getModeIndex();
        if (!isCaptureIntent() && mCurrentModeIndex != modeIndex)
        {
            onModeSelected(modeIndex);
        }

        if (mResetToPreviewOnResume)
        {
            mCameraAppUI.resume();
            mResetToPreviewOnResume = false;
        }
    }

    @Override
    protected void onStopTasks()
    {
        mIsActivityRunning = false;
        mPanoramaViewHelper.onStop();

        mLocationManager.disconnect();
    }

    @Override
    public void onDestroyTasks()
    {
        if (mSecureCamera)
        {
            unregisterReceiver(mShutdownReceiver);
        }

        // Ensure anything that checks for "isPaused" returns true.
        mPaused = true;

        mSettingsManager.removeAllListeners();
        if (mCameraController != null)
        {
            mCameraController.removeCallbackReceiver();
            mCameraController.setCameraExceptionHandler(null);
        }
        if (mLocalImagesObserver != null)
        {
            getContentResolver().unregisterContentObserver(mLocalImagesObserver);
        }
        if (mLocalVideosObserver != null)
        {
            getContentResolver().unregisterContentObserver(mLocalVideosObserver);
        }
        getServices().getCaptureSessionManager().removeSessionListener(mSessionListener);
        if (mCameraAppUI != null)
        {
            mCameraAppUI.onDestroy();
        }
        if (mModeListView != null)
        {
            mModeListView.setVisibilityChangedListener(null);
        }
        mCameraController = null;
        mSettingsManager = null;
        mOrientationManager = null;
        mButtonManager = null;
        if (mSoundPlayer != null)
        {
            mSoundPlayer.release();
        }
        if (mFirstRunDialog != null)
        {
            mFirstRunDialog.dismiss();
        }
        CameraAgentFactory.recycle(CameraAgentFactory.CameraApi.API_1);
        CameraAgentFactory.recycle(CameraAgentFactory.CameraApi.AUTO);
    }

    @Override
    public void onConfigurationChanged(Configuration config)
    {
        super.onConfigurationChanged(config);
        Log.v(TAG, "onConfigurationChanged");
        if (config.orientation == Configuration.ORIENTATION_UNDEFINED)
        {
            return;
        }

        if (mLastLayoutOrientation != config.orientation)
        {
            mLastLayoutOrientation = config.orientation;
            mCurrentModule.onLayoutOrientationChanged(mLastLayoutOrientation == Configuration.ORIENTATION_LANDSCAPE);
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event)
    {
        if (!mFilmstripVisible)
        {
            if (mCurrentModule.onKeyDown(keyCode, event))
            {
                return true;
            }
            // Prevent software keyboard or voice search from showing up.
            if (keyCode == KeyEvent.KEYCODE_SEARCH || keyCode == KeyEvent.KEYCODE_MENU)
            {
                if (event.isLongPress())
                {
                    return true;
                }
            }
        }

        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event)
    {
        if (!mFilmstripVisible)
        {
            // If a module is in the middle of capture, it should
            // consume the key event.
            if (mCurrentModule.onKeyUp(keyCode, event))
            {
                return true;
            } else if (keyCode == KeyEvent.KEYCODE_MENU || keyCode == KeyEvent.KEYCODE_DPAD_LEFT)
            {
                // Let the mode list view consume the event.
                mCameraAppUI.openModeList();
                return true;
            } else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT)
            {
                mCameraAppUI.showFilmstrip();
                return true;
            }
        } else
        {
            if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT)
            {
                mFilmstripController.goToNextItem();
                return true;
            } else if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT)
            {
                boolean wentToPrevious = mFilmstripController.goToPreviousItem();
                if (!wentToPrevious)
                {
                    // at beginning of filmstrip, hide and go back to preview
                    mCameraAppUI.hideFilmstrip();
                }
                return true;
            }
        }
        return super.onKeyUp(keyCode, event);
    }

    @Override
    public void onBackPressed()
    {
        if (!mCameraAppUI.onBackPressed())
        {
            if (!mCurrentModule.onBackPressed())
            {
                super.onBackPressed();
            }
        }
    }

    @Override
    public boolean isAutoRotateScreen()
    {
        // TODO: Move to OrientationManager.
        return mAutoRotateScreen;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.filmstrip_menu, menu);
        mActionBarMenu = menu;

        // add a button for launching the gallery
        if (mGalleryIntent != null)
        {
            CharSequence appName = IntentHelper.getGalleryAppName(mAppContext, mGalleryIntent);
            if (appName != null)
            {
                MenuItem menuItem = menu.add(appName);
                menuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
                menuItem.setIntent(mGalleryIntent);

                Drawable galleryLogo = IntentHelper.getGalleryIcon(mAppContext, mGalleryIntent);
                if (galleryLogo != null)
                {
                    menuItem.setIcon(galleryLogo);
                }
            }
        }

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu)
    {
        if (isSecureCamera() && !ApiHelper.isLOrHigher())
        {
            // Compatibility pre-L: launching new activities right above
            // lockscreen does not reliably work, only show help if not secure
            menu.removeItem(R.id.action_help_and_feedback);
        }

        return super.onPrepareOptionsMenu(menu);
    }

    protected long getStorageSpaceBytes()
    {
        synchronized (mStorageSpaceLock)
        {
            return mStorageSpaceBytes;
        }
    }

    protected interface OnStorageUpdateDoneListener
    {
        public void onStorageUpdateDone(long bytes);
    }

    protected void updateStorageSpaceAndHint(final OnStorageUpdateDoneListener callback)
    {
        /*
         * We execute disk operations on a background thread in order to
         * free up the UI thread.  Synchronizing on the lock below ensures
         * that when getStorageSpaceBytes is called, the main thread waits
         * until this method has completed.
         *
         * However, .execute() does not ensure this execution block will be
         * run right away (.execute() schedules this AsyncTask for sometime
         * in the future. executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR)
         * tries to execute the task in parellel with other AsyncTasks, but
         * there's still no guarantee).
         * e.g. don't call this then immediately call getStorageSpaceBytes().
         * Instead, pass in an OnStorageUpdateDoneListener.
         */
        (new AsyncTask<Void, Void, Long>()
        {
            @Override
            protected Long doInBackground(Void... arg)
            {
                synchronized (mStorageSpaceLock)
                {
                    mStorageSpaceBytes = Storage.getAvailableSpace();
                    return mStorageSpaceBytes;
                }
            }

            @Override
            protected void onPostExecute(Long bytes)
            {
                updateStorageHint(bytes);
                // This callback returns after I/O to check disk, so we could be
                // pausing and shutting down. If so, don't bother invoking.
                if (callback != null && !mPaused)
                {
                    callback.onStorageUpdateDone(bytes);
                } else
                {
                    Log.v(TAG, "ignoring storage callback after activity pause");
                }
            }
        }).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
    }

    protected void updateStorageHint(long storageSpace)
    {
        if (!mIsActivityRunning)
        {
            return;
        }

        String message = null;
        if (storageSpace == Storage.UNAVAILABLE)
        {
            message = getString(R.string.no_storage);
        } else if (storageSpace == Storage.PREPARING)
        {
            message = getString(R.string.preparing_sd);
        } else if (storageSpace == Storage.UNKNOWN_SIZE)
        {
            message = getString(R.string.access_sd_fail);
        } else if (storageSpace <= Storage.LOW_STORAGE_THRESHOLD_BYTES)
        {
            message = getString(R.string.spaceIsLow_content);
        }

        if (message != null)
        {
            Log.w(TAG, "Storage warning: " + message);
            if (mStorageHint == null)
            {
                mStorageHint = OnScreenHint.makeText(CameraActivity.this, message);
            } else
            {
                mStorageHint.setText(message);
            }
            mStorageHint.show();
            UsageStatistics.instance().storageWarning(storageSpace);

            // Disable all user interactions,
            mCameraAppUI.setDisableAllUserInteractions(true);
        } else if (mStorageHint != null)
        {
            mStorageHint.cancel();
            mStorageHint = null;

            // Re-enable all user interactions.
            mCameraAppUI.setDisableAllUserInteractions(false);
        }
    }

    protected void setResultEx(int resultCode)
    {
        mResultCodeForTesting = resultCode;
        setResult(resultCode);
    }

    protected void setResultEx(int resultCode, Intent data)
    {
        mResultCodeForTesting = resultCode;
        mResultDataForTesting = data;
        setResult(resultCode, data);
    }

    public int getResultCode()
    {
        return mResultCodeForTesting;
    }

    public Intent getResultData()
    {
        return mResultDataForTesting;
    }

    public boolean isSecureCamera()
    {
        return mSecureCamera;
    }

    @Override
    public boolean isPaused()
    {
        return mPaused;
    }

    @Override
    public int getPreferredChildModeIndex(int modeIndex)
    {
        if (modeIndex == getResources().getInteger(R.integer.camera_mode_photo))
        {
            boolean hdrPlusOn = Keys.isHdrPlusOn(mSettingsManager);
            if (hdrPlusOn && GcamHelper.hasGcamAsSeparateModule(mFeatureConfig))
            {
                modeIndex = getResources().getInteger(R.integer.camera_mode_gcam);
            }
        }
        return modeIndex;
    }

    @Override
    public void onModeSelected(int modeIndex)
    {
        if (mCurrentModeIndex == modeIndex)
        {
            return;
        }

        CameraPerformanceTracker.onEvent(CameraPerformanceTracker.MODE_SWITCH_START);
        // Record last used camera mode for quick switching
        if (modeIndex == getResources().getInteger(R.integer.camera_mode_photo) || modeIndex == getResources()
                .getInteger(R.integer.camera_mode_gcam))
        {
            mSettingsManager.set(SettingsManager.SCOPE_GLOBAL, Keys.KEY_CAMERA_MODULE_LAST_USED, modeIndex);
        }

        closeModule(mCurrentModule);

        // Select the correct module index from the mode switcher index.
        modeIndex = getPreferredChildModeIndex(modeIndex);
        setModuleFromModeIndex(modeIndex);

        mCameraAppUI.resetBottomControls(mCurrentModule, modeIndex);
        mCameraAppUI.addShutterListener(mCurrentModule);
        openModule(mCurrentModule);
        // Store the module index so we can use it the next time the Camera
        // starts up.
        mSettingsManager.set(SettingsManager.SCOPE_GLOBAL, Keys.KEY_STARTUP_MODULE_INDEX, modeIndex);
    }

    /**
     * Shows the settings dialog.
     */
    @Override
    public void onSettingsSelected()
    {
        UsageStatistics.instance().controlUsed(eventprotos.ControlEvent.ControlType.OVERALL_SETTINGS);
        Intent intent = new Intent(this, CameraSettingsActivity.class);
        startActivity(intent);
    }

    @Override
    public void freezeScreenUntilPreviewReady()
    {
        mCameraAppUI.freezeScreenUntilPreviewReady();
    }

    @Override
    public int getModuleId(int modeIndex)
    {
        ModuleManagerImpl.ModuleAgent agent = mModuleManager.getModuleAgent(modeIndex);
        if (agent == null)
        {
            return -1;
        }
        return agent.getModuleId();
    }

    /**
     * Sets the mCurrentModuleIndex, creates a new module instance for the given
     * index an sets it as mCurrentModule.
     */
    private void setModuleFromModeIndex(int modeIndex)
    {
        ModuleManagerImpl.ModuleAgent agent = mModuleManager.getModuleAgent(modeIndex);
        if (agent == null)
        {
            return;
        }
        if (!agent.requestAppForCamera())
        {
            mCameraController.closeCamera(true);
        }
        mCurrentModeIndex = agent.getModuleId();
        mCurrentModule = (CameraModule) agent.createModule(this, getIntent());
    }

    @Override
    public SettingsManager getSettingsManager()
    {
        return mSettingsManager;
    }

    @Override
    public ResolutionSetting getResolutionSetting()
    {
        return mResolutionSetting;
    }

    @Override
    public CameraServices getServices()
    {
        return CameraServicesImpl.instance();
    }

    @Override
    public FatalErrorHandler getFatalErrorHandler()
    {
        return mFatalErrorHandler;
    }

    public List<String> getSupportedModeNames()
    {
        List<Integer> indices = mModuleManager.getSupportedModeIndexList();
        List<String> supported = new ArrayList<String>();

        for (Integer modeIndex : indices)
        {
            String name = CameraUtil.getCameraModeText(modeIndex, mAppContext);
            if (name != null && !name.equals(""))
            {
                supported.add(name);
            }
        }
        return supported;
    }

    @Override
    public ButtonManager getButtonManager()
    {
        if (mButtonManager == null)
        {
            mButtonManager = new ButtonManager(this);
        }
        return mButtonManager;
    }

    @Override
    public SoundPlayer getSoundPlayer()
    {
        return mSoundPlayer;
    }

    /**
     * Launches an ACTION_EDIT intent for the given local data item. If
     * 'withTinyPlanet' is set, this will show a disambig dialog first to let
     * the user start either the tiny planet editor or another photo editor.
     *
     * @param data The data item to edit.
     */
    public void launchEditor(FilmstripItem data)
    {
        Intent intent = new Intent(Intent.ACTION_EDIT).setDataAndType(data.getData().getUri(), data.getData()
                .getMimeType()).setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        try
        {
            launchActivityByIntent(intent);
        } catch (ActivityNotFoundException e)
        {
            final String msgEditWith = getResources().getString(R.string.edit_with);
            launchActivityByIntent(Intent.createChooser(intent, msgEditWith));
        }
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo)
    {
        super.onCreateContextMenu(menu, v, menuInfo);

        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.filmstrip_context_menu, menu);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item)
    {
        switch (item.getItemId())
        {
            case R.id.tiny_planet_editor:
                mMyFilmstripBottomControlListener.onTinyPlanet();
                return true;
            case R.id.photo_editor:
                mMyFilmstripBottomControlListener.onEdit();
                return true;
        }
        return false;
    }

    /**
     * Launch the tiny planet editor.
     *
     * @param data The data must be a 360 degree stereographically mapped
     *             panoramic image. It will not be modified, instead a new item
     *             with the result will be added to the filmstrip.
     */
    public void launchTinyPlanetEditor(FilmstripItem data)
    {
        TinyPlanetFragment fragment = new TinyPlanetFragment();
        Bundle bundle = new Bundle();
        bundle.putString(TinyPlanetFragment.ARGUMENT_URI, data.getData().getUri().toString());
        bundle.putString(TinyPlanetFragment.ARGUMENT_TITLE, data.getData().getTitle());
        fragment.setArguments(bundle);
        fragment.show(getFragmentManager(), "tiny_planet");
    }

    /**
     * Returns what UI mode (capture mode or filmstrip) we are in.
     * Returned number one of {@link com.google.common.logging.eventprotos.NavigationChange.Mode}
     */
    private int currentUserInterfaceMode()
    {
        int mode = NavigationChange.Mode.UNKNOWN_MODE;
        if (mCurrentModeIndex == getResources().getInteger(R.integer.camera_mode_photo))
        {
            mode = NavigationChange.Mode.PHOTO_CAPTURE;
        }
        if (mCurrentModeIndex == getResources().getInteger(R.integer.camera_mode_video))
        {
            mode = NavigationChange.Mode.VIDEO_CAPTURE;
        }
        if (mCurrentModeIndex == getResources().getInteger(R.integer.camera_mode_refocus))
        {
            mode = NavigationChange.Mode.LENS_BLUR;
        }
        if (mCurrentModeIndex == getResources().getInteger(R.integer.camera_mode_gcam))
        {
            mode = NavigationChange.Mode.HDR_PLUS;
        }
        if (mCurrentModeIndex == getResources().getInteger(R.integer.camera_mode_photosphere))
        {
            mode = NavigationChange.Mode.PHOTO_SPHERE;
        }
        if (mCurrentModeIndex == getResources().getInteger(R.integer.camera_mode_panorama))
        {
            mode = NavigationChange.Mode.PANORAMA;
        }
        if (mFilmstripVisible)
        {
            mode = NavigationChange.Mode.FILMSTRIP;
        }
        return mode;
    }

    private void openModule(CameraModule module)
    {
        module.init(this, isSecureCamera(), isCaptureIntent());
        module.hardResetSettings(mSettingsManager);
        // Hide accessibility zoom UI by default. Modules will enable it themselves if required.
        getCameraAppUI().hideAccessibilityZoomUI();
        if (!mPaused)
        {
            module.resume();
            UsageStatistics.instance()
                    .changeScreen(currentUserInterfaceMode(), NavigationChange.InteractionCause.BUTTON);
            updatePreviewVisibility();
        }
    }

    private void closeModule(CameraModule module)
    {
        module.pause();
        mCameraAppUI.clearModuleUI();
    }

    private void performDeletion()
    {
        if (!mPendingDeletion)
        {
            return;
        }
        hideUndoDeletionBar(false);
        mDataAdapter.executeDeletion();
    }

    public void showUndoDeletionBar()
    {
        if (mPendingDeletion)
        {
            performDeletion();
        }
        Log.v(TAG, "showing undo bar");
        mPendingDeletion = true;
        if (mUndoDeletionBar == null)
        {
            ViewGroup v = (ViewGroup) getLayoutInflater().inflate(R.layout.undo_bar, mAboveFilmstripControlLayout,
                    true);
            mUndoDeletionBar = (ViewGroup) v.findViewById(R.id.camera_undo_deletion_bar);
            View button = mUndoDeletionBar.findViewById(R.id.camera_undo_deletion_button);
            button.setOnClickListener(new View.OnClickListener()
            {
                @Override
                public void onClick(View view)
                {
                    mDataAdapter.undoDeletion();
                    // Fix for b/21666018: When undoing a delete in Fullscreen
                    // mode, just flip
                    // back to the filmstrip to force a refresh.
                    if (mFilmstripController.inFullScreen())
                    {
                        mFilmstripController.goToFilmstrip();
                    }
                    hideUndoDeletionBar(true);
                }
            });
            // Setting undo bar clickable to avoid touch events going through
            // the bar to the buttons (eg. edit button, etc) underneath the bar.
            mUndoDeletionBar.setClickable(true);
            // When there is user interaction going on with the undo button, we
            // do not want to hide the undo bar.
            button.setOnTouchListener(new View.OnTouchListener()
            {
                @Override
                public boolean onTouch(View v, MotionEvent event)
                {
                    if (event.getActionMasked() == MotionEvent.ACTION_DOWN)
                    {
                        mIsUndoingDeletion = true;
                    } else if (event.getActionMasked() == MotionEvent.ACTION_UP)
                    {
                        mIsUndoingDeletion = false;
                    }
                    return false;
                }
            });
        }
        mUndoDeletionBar.setAlpha(0f);
        mUndoDeletionBar.setVisibility(View.VISIBLE);
        mUndoDeletionBar.animate().setDuration(200).alpha(1f).setListener(null).start();
    }

    private void hideUndoDeletionBar(boolean withAnimation)
    {
        Log.v(TAG, "Hiding undo deletion bar");
        mPendingDeletion = false;
        if (mUndoDeletionBar != null)
        {
            if (withAnimation)
            {
                mUndoDeletionBar.animate().setDuration(200).alpha(0f).setListener(new Animator.AnimatorListener()
                {
                    @Override
                    public void onAnimationStart(Animator animation)
                    {
                        // Do nothing.
                    }

                    @Override
                    public void onAnimationEnd(Animator animation)
                    {
                        mUndoDeletionBar.setVisibility(View.GONE);
                    }

                    @Override
                    public void onAnimationCancel(Animator animation)
                    {
                        // Do nothing.
                    }

                    @Override
                    public void onAnimationRepeat(Animator animation)
                    {
                        // Do nothing.
                    }
                }).start();
            } else
            {
                mUndoDeletionBar.setVisibility(View.GONE);
            }
        }
    }

    /**
     * Enable/disable swipe-to-filmstrip. Will always disable swipe if in
     * capture intent.
     *
     * @param enable {@code true} to enable swipe.
     */
    public void setSwipingEnabled(boolean enable)
    {
        // TODO: Bring back the functionality.
        if (isCaptureIntent())
        {
            // lockPreview(true);
        } else
        {
            // lockPreview(!enable);
        }
    }

    // Accessor methods for getting latency times used in performance testing
    public long getFirstPreviewTime()
    {
        if (mCurrentModule instanceof PhotoModule)
        {
            long coverHiddenTime = getCameraAppUI().getCoverHiddenTime();
            if (coverHiddenTime != -1)
            {
                return coverHiddenTime - mOnCreateTime;
            }
        }
        return -1;
    }

    public long getAutoFocusTime()
    {
        return (mCurrentModule instanceof PhotoModule) ? ((PhotoModule) mCurrentModule).mAutoFocusTime : -1;
    }

    public long getShutterLag()
    {
        return (mCurrentModule instanceof PhotoModule) ? ((PhotoModule) mCurrentModule).mShutterLag : -1;
    }

    public long getShutterToPictureDisplayedTime()
    {
        return (mCurrentModule instanceof PhotoModule) ? ((PhotoModule) mCurrentModule)
                .mShutterToPictureDisplayedTime : -1;
    }

    public long getPictureDisplayedToJpegCallbackTime()
    {
        return (mCurrentModule instanceof PhotoModule) ? ((PhotoModule) mCurrentModule)
                .mPictureDisplayedToJpegCallbackTime : -1;
    }

    public long getJpegCallbackFinishTime()
    {
        return (mCurrentModule instanceof PhotoModule) ? ((PhotoModule) mCurrentModule).mJpegCallbackFinishTime : -1;
    }

    public long getCaptureStartTime()
    {
        return (mCurrentModule instanceof PhotoModule) ? ((PhotoModule) mCurrentModule).mCaptureStartTime : -1;
    }

    public boolean isRecording()
    {
        return (mCurrentModule instanceof VideoModule) ? ((VideoModule) mCurrentModule).isRecording() : false;
    }

    public CameraAgent.CameraOpenCallback getCameraOpenErrorCallback()
    {
        return mCameraController;
    }

    // For debugging purposes only.
    public CameraModule getCurrentModule()
    {
        return mCurrentModule;
    }

    @Override
    public void showTutorial(AbstractTutorialOverlay tutorial)
    {
        mCameraAppUI.showTutorial(tutorial, getLayoutInflater());
    }

    @Override
    public void finishActivityWithIntentCompleted(Intent resultIntent)
    {
        finishActivityWithIntentResult(Activity.RESULT_OK, resultIntent);
    }

    @Override
    public void finishActivityWithIntentCanceled()
    {
        finishActivityWithIntentResult(Activity.RESULT_CANCELED, new Intent());
    }

    private void finishActivityWithIntentResult(int resultCode, Intent resultIntent)
    {
        mResultCodeForTesting = resultCode;
        mResultDataForTesting = resultIntent;
        setResult(resultCode, resultIntent);
        finish();
    }

    private void keepScreenOnForAWhile()
    {
        if (mKeepScreenOn)
        {
            return;
        }
        mMainHandler.removeMessages(MSG_CLEAR_SCREEN_ON_FLAG);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        mMainHandler.sendEmptyMessageDelayed(MSG_CLEAR_SCREEN_ON_FLAG, SCREEN_DELAY_MS);
    }

    private void resetScreenOn()
    {
        mKeepScreenOn = false;
        mMainHandler.removeMessages(MSG_CLEAR_SCREEN_ON_FLAG);
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    }

    /**
     * @return {@code true} if the Gallery is launched successfully.
     */
    private boolean startGallery()
    {
        if (mGalleryIntent == null)
        {
            return false;
        }
        try
        {
            UsageStatistics.instance()
                    .changeScreen(NavigationChange.Mode.GALLERY, NavigationChange.InteractionCause.BUTTON);
            Intent startGalleryIntent = new Intent(mGalleryIntent);
            int currentIndex = mFilmstripController.getCurrentAdapterIndex();
            FilmstripItem currentFilmstripItem = mDataAdapter.getItemAt(currentIndex);
            if (currentFilmstripItem != null)
            {
                GalleryHelper.setContentUri(startGalleryIntent, currentFilmstripItem.getData().getUri());
            }
            launchActivityByIntent(startGalleryIntent);
        } catch (ActivityNotFoundException e)
        {
            Log.w(TAG, "Failed to launch gallery activity, closing");
        }
        return false;
    }

    private void setNfcBeamPushUriFromData(FilmstripItem data)
    {
        final Uri uri = data.getData().getUri();
        if (uri != Uri.EMPTY)
        {
            mNfcPushUris[0] = uri;
        } else
        {
            mNfcPushUris[0] = null;
        }
    }

    /**
     * Updates the visibility of the filmstrip bottom controls and action bar.
     */
    private void updateUiByData(final int index)
    {
        final FilmstripItem currentData = mDataAdapter.getItemAt(index);
        if (currentData == null)
        {
            Log.w(TAG, "Current data ID not found.");
            hideSessionProgress();
            return;
        }
        updateActionBarMenu(currentData);

        /* Bottom controls. */
        updateBottomControlsByData(currentData);

        if (isSecureCamera())
        {
            // We cannot show buttons in secure camera since go to other
            // activities might create a security hole.
            mCameraAppUI.getFilmstripBottomControls().hideControls();
            return;
        }

        setNfcBeamPushUriFromData(currentData);

        if (!mDataAdapter.isMetadataUpdatedAt(index))
        {
            mDataAdapter.updateMetadataAt(index);
        }
    }

    /**
     * Updates the bottom controls based on the data.
     */
    private void updateBottomControlsByData(final FilmstripItem currentData)
    {

        final CameraAppUI.BottomPanel filmstripBottomPanel = mCameraAppUI.getFilmstripBottomControls();
        filmstripBottomPanel.showControls();
        filmstripBottomPanel.setEditButtonVisibility(currentData.getAttributes().canEdit());
        filmstripBottomPanel.setShareButtonVisibility(currentData.getAttributes().canShare());
        filmstripBottomPanel.setDeleteButtonVisibility(currentData.getAttributes().canDelete());

        /* Progress bar */

        Uri contentUri = currentData.getData().getUri();
        CaptureSessionManager sessionManager = getServices().getCaptureSessionManager();

        if (sessionManager.hasErrorMessage(contentUri))
        {
            showProcessError(sessionManager.getErrorMessageId(contentUri));
        } else
        {
            filmstripBottomPanel.hideProgressError();
            CaptureSession session = sessionManager.getSession(contentUri);

            if (session != null)
            {
                int sessionProgress = session.getProgress();

                if (sessionProgress < 0)
                {
                    hideSessionProgress();
                } else
                {
                    int progressMessageId = session.getProgressMessageId();
                    showSessionProgress(progressMessageId);
                    updateSessionProgress(sessionProgress);
                }
            } else
            {
                hideSessionProgress();
            }
        }

        /* View button */

        // We need to add this to a separate DB.
        final int viewButtonVisibility;
        if (currentData.getMetadata().isUsePanoramaViewer())
        {
            viewButtonVisibility = CameraAppUI.BottomPanel.VIEWER_PHOTO_SPHERE;
        } else if (currentData.getMetadata().isHasRgbzData())
        {
            viewButtonVisibility = CameraAppUI.BottomPanel.VIEWER_REFOCUS;
        } else
        {
            viewButtonVisibility = CameraAppUI.BottomPanel.VIEWER_NONE;
        }

        filmstripBottomPanel.setTinyPlanetEnabled(currentData.getMetadata().isPanorama360());
        filmstripBottomPanel.setViewerButtonVisibility(viewButtonVisibility);
    }

    private void showDetailsDialog(int index)
    {
        final FilmstripItem data = mDataAdapter.getItemAt(index);
        if (data == null)
        {
            return;
        }
        Optional<MediaDetails> details = data.getMediaDetails();
        if (!details.isPresent())
        {
            return;
        }
        Dialog detailDialog = DetailsDialog.create(CameraActivity.this, details.get());
        detailDialog.show();
        UsageStatistics.instance()
                .mediaInteraction(fileNameFromAdapterAtIndex(index), MediaInteraction.InteractionType.DETAILS,
                        NavigationChange.InteractionCause.BUTTON, fileAgeFromAdapterAtIndex(index));
    }

    /**
     * Show or hide action bar items depending on current data type.
     */
    private void updateActionBarMenu(FilmstripItem data)
    {
        if (mActionBarMenu == null)
        {
            return;
        }

        MenuItem detailsMenuItem = mActionBarMenu.findItem(R.id.action_details);
        if (detailsMenuItem == null)
        {
            return;
        }

        boolean showDetails = data.getAttributes().hasDetailedCaptureInfo();
        detailsMenuItem.setVisible(showDetails);
    }
}
